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Neuroscience Test 2
CNS developement, Auditory & vestibular systems, Somatic Sensory System, Chemcial Sense, they eye, central visual system, spinal control of movement, and Brain control of movement
211
Medical
Graduate
02/25/2013

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Cards

Term
Name the 3 chemical senses
Definition
Gustation
Olfaction
Chemoreceptors
Term
an amino acid that makes things more savory. Causes a secondary chemical measure to the brain to make you feel good about what you are eating.
Definition
umami
Term
location of the tongue for salty and sweet
Definition
tip of the tongue
Term
T/F Tastebuds are synonymous with papillae
Definition
False. There are many tastebuds on each papillae (from 10-hundreds)
Term
What separates the external ear from middle ear?
Definition
the tympanic membrane
Term
What separates the middle ear from inner ear
Definition
oval window
Term
Function of the ossicles
Definition
amplifies the sound of air into liquid vibrations
Term
The ___ system informs our nervous system where our head and body are and how they are moving. This info is used without conscious effort to control muscular contractions that will put our body where we want it to be, to reorient ourselves when something pushes us aside, and to move our eyes so that our visual world stays fixed on our retinas even when our head is bouncing around.
Definition
The vestibular system.
Term
cartilaginous part of your ear that is external to your skull
Definition
pinna
Term
Entrance to the inner ear, extending about 2.5cm into the skull.
Definition
auditory canal
Term
Is pressure greater at the tympanic membrane or oval window?
Definition
oval window
Term
Response where onset of loud sound causes tensor tympani and stapedius muscle contraction
Function: Adapt ear to loud sounds, understand speech better
Definition
Attenuation reflex (to protect ear from loud sounds)
Term
When you yawn to decrease pressure in the middle ear, you are opening the ___ ___
Definition
Eustachian tube
Term
Compare and contrast the electrical potential of perilymph and endolymph.
Definition
endolymph is 80mV more positive than perilymph (or could be worded as perilymph is 80mV less positive than endolymph)
Term
What causes depolarization in the organ of corti (endolyph)?
Definition
High concentration of POTASSIUM and low Na+ (opposite of most cells)
Term
T/F- sounds travel further in air than in water?
Definition
False, water is more dense
Term
How does a cochlear implant work?
Definition
A cochlear implant DIRECTLY stimulates the auditory nerve.
Term
it takes longer to reach the other ear, further from the sound.
Definition
interaural time delay
Term
There is also a difference in the sound intensity too (your head blocks sounds from the opposite side).
Definition
interaural intensity difference
Term
the idea that interaural time delay and interaural intensity differency combine to create sound localization (how you figure out where sound is coming from).
Definition
Duplex theory of sound localization
Term
important for almost all sensory systems as a relay.
Definition
medial lemniscus (thalamus)
Term
the spatial arrangement of where sounds of different frequency are processed in the brain.
Definition
tonotopy
Term
Importance of the ossicles?
Definition
the ossicles (3 bones that move and push on the oval window) provide the amplification needed to move the fluid of the cochlea. The ossicles ensure that there is enough force on the small surface area.
Term
What two muscles help your ear to react to sounds that are too loud (attenuation affect)?
Definition
tensor tympani and stapedius
Term
Sound attenuation is much greater at high/low frequencies?
Definition
Sound attenuation is much greater at LOW frequencies
Term
Which system does the cochlea belong to?
Definition
auditory
Term
which system does the labyrinth belong to?
Definition
vestibular
Term
Where is the vestibular labyrinth located?
Definition
the inner ear
Term
Where are auditory receptor neurons held?
Definition
on the organ of Corti, which is on the basilar membraine of the scala media in the cochlea.
Term
high or low frequency waves travel further?
Definition
low
Term
Auditory-vestibular nerve
Definition
cranial nerve VIII
Term
part of the vestibular system for gravity and tilt (linear and tilt)
Definition
Otolith organs
Term
Part of the vestibular system for angular motion head rotation.
Definition
semicircular canals.
Term
Info about sound intensity is coded in what two interrelated ways?
Definition
sound frequency (firing rates of neurons) and the population (number of active neurons)
Term
What happens if you have unilateral loss of A1?
Definition
you loss the ability to locate sound precisely, but you do NOT become deaf
Term
Your head moves, but your eyes try to stay in the same spot
Definition
vestibular/ocular reflex
Term
In the vestibular system, some hair cells depolarize in the ear, while others hyperpolarize in the same ear to signify direction. T/F
Definition
False- the stereo and kinocilia are mechanically linked, so all will depolarize or hyperpolarize
Term
What gives us linear acceleration?
Definition
utricle
Term
the uncontrolled movements or jerking of the eye muscles at the end rage of the visual field.
Definition
nystagmus
Term
nerve responsible for the central pathways of the vestibular system?
Definition
vestibulochoclear nerve VIII (8)
Term
nerves responsible for vestibulocular reflex?
Definition
CN III: Oculomotor
CN IV: Trochlear
CN VI: Abducens
Term
detects the force of gravity
Definition
otolith organs in the vestibular system
Term
sensitive to head rotation
Definition
semicircular canals
Term
The two chambers of the otoliths?
Definition
saccule and the utricle
Term
sensory epithelium of the otolith organs (sccule and utricle)
Definition
macula
Term
head tilted forward, depolarization or hyperpolarization?
Definition
depolarization
Term
head tilted backwards, depolarization or hyperpolarization?
Definition
hyperpolarization
Term
Detects angular acceleration
Definition
semicircular canals
Term
Describe the push-pull activation of the semicircular canals
Definition
Head rotation causes the excitation of hair cells in one horizontal semicircular canal and inhibition of hair cells in the other.
Term
Two reflex systems that are very similar...
Definition
ocular motor reflex and vestibular ocular reflex (linked by vestibularoccular reflex)
Term
"the broadly tuned receptors" (x2)
Definition
gustation (taste) and olfaction (smell)
Term
Cranial nerve for anterior 2/3 of tongue
Definition
CN7- facial
Term
Cranial nerve for posterior 1/3 of tongue
Definition
CN9- glossopharangeal
Term
cranial nerve for epiglottis innervation, tasting bitter makes you gag because the epiglottis is stimulated...
Definition
CN 10- vagus
Term
No sense of smell
Definition
anosmia
Term
Photoreceptor type that is better at night
Definition
rods (more peripheral)
Term
photoreceptor type that is better during the day
Definition
cones (more centralized and contains color)
Term
what colors have higher energy and can be more harmful?
Definition
blue/cool colors
Term
light bouncing off
Definition
reflection
Term
bending light because of a change in medium
Definition
refraction
Term
A young girl suffers from a TBI that reportedly created a lesion in her optic chiasm. How would you expect her visual field to be affected by this accident?
Definition
She will have tunnel vision or an inability to see outside of the central visual field. Aka. "bitemporal hemianopsia"
Term
Word describing "tunnel vision" caused by a lesion to the optic chiasm?
Definition
bitemporal hemianopsia
Term
Word describing loss of site caused by a lesion to the optic tract (and resulting loss of vision in the opposite visual field).
Definition
homonymous hemianopsia
Term
When you disrupt or mechanically stimulate the chain of neurons brining in afferent info leading to the cortex... (i.e. poking your eye and seeing light)
Definition
label line modality
Term
a fast and dynamic type of adaptation (ex. When I put on a shirt, I only notice it when it’s being put on and when it’s taken off, you phase out the stimulus in your head).
Definition
phasic adaption
Term
you slowly adapt (ex. Adjusting to the temperature in the swimming pool, or not forgetting that you are holding a pencil as you write).
Definition
tonic adaptation
Term
give us the sensation of pressure and vibration. It is one of the hardest sensory experiences to eliminate.
Definition
Pacinian corpuscles
Term
very deep and are coded to feel heat. Thermal receptors.
Definition
Ruffini's receptors
Term
very shallow and are coded for light discriminatory touch. In our fingers.
Definition
Meissener's corpuscles
Term
very shallow and code for light touch.
Definition
Merkel's disks
Term
deep receptors and code for cold.
Definition
Krause end bulbs
Term
When a child applies pressure to their thumb after cutting their finger, they expect the sensation of pressure to reach their brain theoretically before pain. What is this an example of?
Definition
label line modalities
Term
Mechanoreceptor that has a large field size and rapid adaptation?
Definition
Pacinian corpuscle. give us the sensation of pressure and vibration.
Term
Mechanoreceptor that has a large receptor field and is slow to adapt?
Definition
Ruffini’s endings. very deep and are coded to feel heat.
Term
Mechanoreceptor that has a small field and is rapid to adapt?
Definition
Meissener's corpuscles. very shallow and are coded for light discriminatory touch. In our fingers.
Term
Type of primary afferent axon that is very fast and well mylenated.
Definition
Aa (alpha alpha)
Term
Type of primary afferent axon that is associated with free nerve endings for pain signals?
Definition
C type. CType are typically unmylinated, associated with our free nerve endings.
Free nerve endings are for pain. Dull throbbing or unnerving pain. Pain fibers are thin.
Term
Type of primary afferent axon for sharp pain (like putting your hand on a stove) Very phasic.
Definition
Agamma (alpha gamma)
Term
-Discriminative touch
-conscious proprioception
-vibration
-pressure
Definition
Dorsal column-medial lemniscal system
Term
Anterolateral system functions
Definition
pain and temperature
Term
Axons bringing information from the somatic sensory receptors to the spinal cord or brain stem?
Definition
primary afferent axons
Term
dorsal root spinal is motor T/F
Definition
FALSE, dorsal root is sensory
Term
Part of the body with the highest resolution two point discrimination?
Definition
hands
Term
Slowest of the axons, conducting at about .5-2m/sec
Definition
C-type afferent axons, coding for pain and temperature sensation. Unmyelinated.
Term
The area of the skin innervated by the right and left dorsal roots of a single spinal segment.
Definition
dermatome
Term
T/F- when a dorsal root is cut, the corresponding dermatome on that side of the body loses all sensation.
Definition
FALSE. The adjacent dorsal roots innervate overlapping areas. To lose all sensation in one dermatome, three adjacent dorsal roots must be cute.
Term
Name for the pathway serving touch
Definition
Dorsal column-medial lemniscal pathway
Term
No sensory information goes directly into the neocortex without first synapsing in what area of the brain?
Definition
The thalamus
Term
At what point does desucation occur for the dorsal column-medial lemniscal pathway?
Definition
At the medulla
Term
Epiglottis innervation?
Definition
Vagus X
Term
Order the following:
blastomere
zygote
morula
blastocyst
Definition
zygote
blastomere
morula
blastocyst
Term
Which plane is sound localized?
Definition
horizontal plane
Term
What is sign of cerebellar damage?
Definition
ataxia (uncoordinated movements)
dysynergia (decomposition of the multijoint movement)
dysmetric= overshoot (unable to aim or do a finger point to nose test)
Term
Ataxia indicates an injury to what part of the brain?
Definition
cerebellum
Term
overshoot, can’t judge distance (nose to finger test)
Definition
dysmetria
Term
lack of coordination of movements at the joints, caused by cerebellar damage.
Definition
Dyssynergia
Term
What happens during a neglect?
Definition
Posterior-parietal injury. When you don’t recognize a part of your body. Often times they don’t realize they have the left side. Draws half a flower
Term
Occulo-motor reflex/vestibuloccular reflex?
Definition
Eye spotting while spinning head.
Term
What does a motor unit consist of?
Definition
1 alpha motor neuron and all of the muscles that it innervates.
Term
Why is organ of corti important?
Definition
Consists of the auditory receptors.
Term
What frequency sound waves are higher pitched?
Definition
high frequency
Term
What is the cross-extensor reflex?
Definition
Flexors on the stimulus side activated, extensors inhibited. Extensors activated on the opposite side to get away from the stimulus, flexors inhibited.
Term
Which is the light sensitive element in the retina?
Definition
photoreceptors (rods and cones)
Term
What is the size principle?
Definition
The idea that the order of the recruitment of motor neurons is due to variation in alpha motor neuron size.
Smallest motor neurons are recruited first for muscle contraction. Largest last
Term
What is visual accommodation?
Definition
Changing of the shape of the lens to allow extra focusing power.
Term
What are central pattern generators called?
Definition
Spinal circuits.
Term
What does a lesion in the V4 region result in?
Definition
Color perception disorder (NOT color blindness, which is genetic)
Term
Reciprocal inhibition?
Definition
The opposite group of muscles from the active muscles relax. antagonist relaxes.
Term
The opposite group of muscles from the active muscles relax. antagonist relaxes.
Definition
reciprocal inhibition
Term
What separates the auditory canal from the middle ear?
Definition
tympanic membrane
Term
What is cortical map plasticity?
Definition
If you use a part of your brain more (ie. your hands have a larger representation in your brain if you are a pianist). The ability of your brain to cover a larger part of the area that is used more. Both motor and sensory.
Term
What is special about the receptor cells of gustation and olfaction?
Definition
They are broadly tuned
Term
Where does light absorption take place?
Definition
in the retina because it is covered in melanin
Term
What happens at the cornea?
Definition
Covers the eye, refraction occurs here at the aqueous humor.
Term
Rods and cones?
Definition
Rods= for night/dark
Cones= daylight, fovea centralis, more concentrated in the inner-eye
Term
Photoreceptors
Definition
rods and cones
Term
bleached rodobsin is found where?
Definition
your eye's cones
Term
unbleached rhodopsin is found where?
Definition
your eye's rods
Term
3 types of cone proteins
Definition
red, green, and blue (trichotomy theory of color)
Term
name two basal ganglia disorders?
Definition
Parkinson's disease (hypokinesia) and Huntington's disease (dyskinesia)
Term
spontaneous, uncontrollable and purposeless movements with rapid, irregular flow and flicking motions of various other parts of the body.
Definition
chorea (often seen in Huntington's disease)
Term
Characterized by violent flinging movements of the extremities, occurring on just one side of the body.
Definition
hemiballismus
Term
Damage to your Putamen Circuit (apart of the basal ganglion in the forebrain) results in what three dysfunctions?
Definition
Athetosis= slow writing, snake-like movements of the neck and trunk.
Hemiballismus= jerking movements on one side of the body.
Chorea= quick, irregular, involuntary movements of the limb, trunk, head, and face.
Term
Which part of your muscles are responsible for proprioception?
Definition
muscle spindles
Term
Via what cells do axons leave the retina?
Definition
ganglion cells
Term
you cannot recognize familiar items by touch.
Definition
astereoagnosis
Term
What happens when you have a hemisection of the spinal cord cut or damaged?
Definition
Pain and temperature is lost on the opposite side (spinal thalamic pathway crosses immediately). You lose pressure and sensation on the same side (straight to the brain before crossing at the medulla).
Term
Why can’t the optic disk sense light?
Definition
no photoreceptors where the optic nerve exits the eye.
Term
jerky motions, cerebellar disability. uncoordinated.
Definition
ataxia (caused by damage to the cerebellum)
Term
inability to motor plan, caused by damage to the frontal lobe.
Definition
apraxia
Term
Area that controls each movement for "Ready, set, and go!"
Definition
Ready= frontal and parietal lobes
Set=supplementary and premotor areas
go!=motor areas of cerebellum (or other areas of the brain depending on the action)
Term
What is the difference between aqueous humor and vitrous humor?
Definition
Aqueous= anterior to cornea
Term
has more potassium, more electropositive than any other electrocellular area in the ear.
Definition
endolymph
Term
What is the function of the semicircular canal?
Definition
angular acceleration
Term
responsible for detecting linear acceleration?
Definition
otoliths in the vestibular system
Term
How does a cochlear implant work?
Definition
directly stimulates the auditory nerve
Term
Which nerve is olfaction?
Definition
CN1
Term
Stages of neurulation
Definition
Neural plate
Fold
Neural tube
Term
What happens when you have a neural crest defect?
Definition
skin pigmentation disorder
Term
What causes albinism?
Definition
damage to the neural crest, specifically the mesoderm where melanin is produced. People who are albino lack melanin in their skin and in their eyes (retina), so they have a hard time with light on their skin and seeing in the light.
Term
involuntary eye movement
Definition
nystagmus
Term
Free, branching, unmyelinated nerve endings that signal that body tissue is being damaged or is at risk of being damaged.
Definition
nocireceptors.
Term
What kind of stimuli do nociceptors respond to?
Definition
mechanical, thermal, and chemical.
Term
Enhances the antigravity reflexes of the spinal cord?
Definition
pontine reticulospinal tract
Term
Liberates the antigravity muscles from reflex control in the spinal cord.
Definition
medullary reticulospinal tract
Term
What is the function of the lateral pathways?
Definition
control motor function distally
Term
What is the function of the vestibulospinal tract?
Definition
head balance
Term
What is the function of the tectospinal tract?
Definition
Constructing the map of the world around us. Directs the head and the eyes to construct the image of the world around us.
Term
What happens if you damage your corticospinal tract?
Definition
Paralyzation/weakness on the opposite side. This is what happens in CVA (stroke)
Term
helps with neuro plasticity in the case that the corticospinal tract is disabled?
Definition
rubrospinal tract
Term
What are lower motor neurons responsible for?
Definition
The final common pathway to direct command.
Term
What is the basis of the visual pathway?
Definition
concentrated activity of neurons
Term
What is the function of the striate cortex?
Definition
Object motion analysis. (so you don’t get hit in the face by a ball.)
Term
What CN innervates the lateral rectus eye muscle?
Definition
VI (6)- abducens (abducts the eye)
Term
What eye muscles does the oculomotor III nerve innervate?
Definition
Superior rectus
Medial rectus
inferior oblique
inferior rectus
Term
What eye muscle(s) does the cranial nerve IV innervate?
Definition
The trochlear cranial nerve 4, innervates the superior oblique
Term
most important nerve to provide info from our face region.
Definition
Trigeminal V
Term
location of S1, the primary sensory cortex?
Definition
adjacent to central sulcus, and primary motor cortex.
Term
designates the percentage of brain designated to a particular part of your body. Cortical mapping.
Definition
Homunculus (cortical somatotopy)
Term
A major part of your brain is devoted to what two body parts (cortical mapping)?
Definition
hands and mouth
Term
Anterolateral system crosses over when?
Definition
IMMEDIATELY, at the same level of injury
Term
The most complex levels of somatosensory processing occur in the ___ ____.
Definition
cerebral cortex.
Term
location of the primary somatosensory cortex (S1)?
Definition
parietal lobe
Term
primary somatosensory cortex (S1) is also known as...
Definition
Brodmann's area 3b.
Term
Disorders caused by damage to the posterior parietal areas?
Definition
-agnosia=inability to recognize objects even though sensory skills appear normal
-astereognosia=cannot recognize common objects by feeling them.
-neglect syndrome= a part of the body or a part of the world is ignored or suppressed.
Term
the sensory process that provides the signals that trigger pain?
Definition
nociception
Term
the feeling or perception of sore, aching, throbbing, sensations of the body
Definition
pain
Term
When cells are damaged,what is one type of sensitizing chemical that directly depolarizes nociceptors to cause the sensation of pain?
Definition
bradykinin (others are prostaglandins and substance P)
Term
First pain is caused by the activation of ___ fibers, and second pain is caused by activation of ____ fibers.
Definition
1. Alpha gamma
2. C fibers
Term
referred pain is known as?
Definition
angina
Term
If you are stabbed in the spine on the right, then kicked in the shin on the R, will you feel the kick?
Definition
YES, the pain from the stabbing crossed over to the left.
Term
Direction of pain pathway up the spinal cord?
Definition
contralateral
Term
Direction of sensory pathway up the spinal cord?
Definition
ipsilateral
Term
Gate theory of pain
Definition
Helps to explain how we modulate pain
Grew out of a certain phenomena, if you grab your finger, pain decreases.
Pressure and sensation (not crossing over first and of myalinated axons) travels faster) and pain comes next. Beat the pain sensation!
Term
Thermoreceptors are fast or slow adapting?
Definition
slowly adapting
Term
Temperature is coupled to what type of primary axon?
Definition
Agamma and C for cold temperatures
C fibers for hot.
coupled with pain.
Term
CP is an example of an upper or lower motor neuron problem?
Definition
upper
Term
spasticity is as a result of upper or lower motor neuron defect?
Definition
upper
Term
digestive tract, arteries, related structures
examples of this type of muscle...
Definition
smooth
Term
Type of muscle:
Cardiac (heart) and skeletal (bulk of body muscle mass)
Definition
striated muscle
Term
location of lower motor neurons?
Definition
in the ventral root of the spinal vertebra.
Term
Wm. Penfield
Definition
homunculus
Term
Idea of crossed motor involvement
(who)
Definition
Ferrier
Term
“The Jacksonian March”
Introduced somatotopic orientation
Definition
Hughlings Jackson
Term
Hierarchy of motor control
Definition
strategy- neocortex basal glantion, middle=tactics, motor cortex/cerebellum,
execution=brainstem and spinal cord
Term
Axons from brain descend along two major pathways
Definition
Lateral Pathways
Ventromedial Pathways
Term
descending pathway for Voluntary movement - originates in cortex
Definition
lateral pathways
Term
components of the lateral tracts?
Definition
Corticospinal tract (pyramidal tract)
Rubrospinal tract
Term
Descending spinal tract for Posture and locomotion - originates in brain stem
Definition
The Ventromedial pathways
Term
descending ventromedial spinal tract for head balance and head turning.
Definition
The Vestibulospinal tract
Term
ventromedial tract for orienting response
Definition
tectospinal tract
Term
The Pontine and Medullary Recticulospinal Recticulospinal tract
are lateral or ventromedial?
Definition
ventromedial
Term
Ml stands for ?
Definition
Primary motor cortex
Term
fires prior to voluntary movement
Definition
Ml, primary motor area, area 4
Term
Primarily active during the planning stage of movement
Definition
premotor cortex
Term
M1 lesion causes what?
Definition
spasticity distally greater than proximal
Term
PMC lesion causes what?
Definition
Apraxia: loss of complex reciprocal movements
Dyscoordination
Alternating movements
Term
SMC lesion
(supplemental motor cortex)
Definition
Akinesia=loss of voluntary movement
Term
Planning Movement
Definition
Contributions of Posterior Parietal and Prefrontal Cortex
Anterior frontal lobes: Abstract thought, decision making and anticipating consequences of action
Area 6: Actions converted into signals specifying how actions will be performed
Term
Monitored cortical activation accompanying voluntary movement (PET)
who
Definition
Roland
Term
“go”
Definition
area 6 (cortex)
Term
Disorders of the caudate circuitry of the basal ganglion?
Definition
Parkinson’s Disease: Dopamine
Huntington’s Chorea: GABA
Term
In the mesencephalon
Serves as an alternate pathway for transmitting cortical information to the spine
Specializes in discrete, fine motor signals
Associated with trained motor responses (riding a bike), and hand movements
Definition
red nucleus
Term
3 parts of the cerebellum
Definition
Flocculonodular lobe: Vestibulocerebellum
Spinocerebellum: Ongoing limb movements
Cerebrocerebellum: Planning and preparation of intended movements
Term
Walking is an example of what descending pathway?
Definition
ventromedial
Term
Taste to posterior 1/3 of tongue
Taste to pharynx
Definition
glossopharyngeal IX
Term
the loss of taste perception
Definition
ageusia
Term
A thin sheet of bone through which small clusters of axons penetrate, coursing to the olfactory bulb
Definition
cribriform plate
Term
smell sensory maps in the brain
Definition
Olfactrotopy
Term
First synaptic relay in the primary visual pathway
Definition
lateral geniculate neucleus (LGN)
Term
reflects the entire spectrum (color)
Definition
white
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