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Notes for lecture 5
54
Anatomy
Undergraduate 3
12/03/2015

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Term
functions of the nervous system
Definition

1. sensory: there are sensory receptors that can detect interal & external stimuli

 

2. integration: wherein the NS can process sensory info by analyzing the info and storing it.

 

3. motor: involved responding to integrative decisions.

Term
afferent neurons
Definition
the neurons that carry sensory info to the brain and spinal cord
Term
interneurons
Definition

- neurons that connect with other neurons

- neurons that analyze sensory info and store it

Term
motor/efferent neurons
Definition
neurons involved in carrying out information from the brain and spinal cord
Term
what are neurons made of?
Definition

dendrites (bring impluses to the cell body)

cell body

axons (take impulses away from the cell body)

Term
what are neurons responsible for?
Definition
allowing thinking, muscle activity, and secretion of glands
Term
what are astrocytes?
Definition

most numerous type of neuroglia cell

helps to create an optimal chemical environment for proper generation of neurons

Term
what is the difference between neurons and neuroglia cells?
Definition
neurons fire impulses; neuroglia cells do not
Term
what are oligodendrocytes?
Definition

neuroglia cells that form and maitain the myelin sheath around CNS axons

 

they speed the rate of transmission of impluses

Term
what two cells form myelin sheath?
Definition
Shwann cells and oligodendrocytes
Term
what do microglia cells do?
Definition

they perfrom phagocytosis;

 

they eat microbes if there is a threat

Term
ependymal
Definition

lines the verticles of the brain and the central canal of the spinal cord

 

also responsible for formation of CSF

Term
multipolar neurons
Definition

have several dendrites and one axon

 

they are the majoirty of neurons in the CNS

Term
Bipolar neurons
Definition

one dendrite and one axon;

 

found in the retina, inner ear, and olfactory are of the brain

Term
unipolar neurons
Definition

begin in the embryo as bipolar neurons

 

later, two processes fuse into one process that divide two branches a short distance away from the cell body

Term
all unipolar neurons are...
Definition
sensory neurons
Term
neuroplasticity is...
Definition

the capability of the nervous system to constantly change, grow and remap itself over the course of one's life;

 

includes: sprouting of new dendrites, synthesis of new proteins, and changes in synaptic contacts with other neurons

Term
the CNS includes...
Definition
the brain and the spinal cord
Term
the PNS includes...
Definition
the cranial and spinal nerves
Term
meninges are the...
Definition
protective covering of the brain and spinal cord
Term
three parts of the meninges are the..
Definition

dura mater

arachnoid

pia mater

Term
three extensions of the dura mater
Definition

falx cerebri

tentorium cerebelli

falx cerebelli

Term
falx cerebri
Definition
inserts and seperates the two hemispheres of the cerebrum
Term
tentorium cerebelli
Definition
seperates the cerebrum from the cerebellum
Term
falx cerebelli
Definition
seperates the two hemispheres of the cerebellem
Term
fronal lobe is responsible for?
Definition
thought and emotion
Term
occipital lobe
Definition
receives visual stimuli from the eyes
Term
temporal lobe
Definition
receives and interprets sound, smell, and taste
Term
parietal lobe
Definition
interprets sensations coming from the body
Term
the cerebrum works??
Definition
contralaterally
Term

grey matter axons are...

white matter axons are...

Definition

grey matter axons are not myelinated

white matter axons are myelinated

Term
the cerebrum (cerebral hemisphere) includes the...
Definition
gyrus (gyri) and sulcus (sulci)
Term
grey matter makes up the...
Definition
cerebral cortex
Term
the cerebrum is attributed as...
Definition
the seat of intelligence; responsible for higher learning
Term
white matter is located?
Definition
deep within the grey matter
Term
three types of cerebral white matter fibers?
Definition

association fibers

commissural fibers

projection fibers

Term
assocition fibers
Definition
transmit impulses between gyri in the same cerebral hemisphere
Term
commissural fibers
Definition
trasmit impulses between gryi in the corresponding hemisphere i.e. the corpus callosum
Term
projection fibers
Definition
establish connections between the cerebrum, thalamus, brainstem and spinal cord
Term
parts of the cerebral cortex
Definition

1. sensory area

2. motor area

3. association area

Term
sensory area of the cerebral cortex consists of...
Definition

a. primary somatosensory area (aka postcentral gyrus): receives impulses from somatic sensory receptors for touch, pain, and temperature

b. primary visual area: involved in visual perception

c. primary auditory area: interprets the basic characteristics of sound like pitch and rhythm

d. primary gustatory area: taste

e. primary olfactory area: smell

Term
motor area of the cerebral cortex consists of...
Definition

a. primary motor area: controls voluntary contractions of specific muscles

 

b. area 44 and area 45 (Broca's area): production of speech

Term
association area of the cerebral cortex includes...
Definition

a. somatosensory association area

b. visual association area

c. auditory association area

d. common integrative area

e. premotor area

f. frontal eye field area

g. language area

Term
aphasia is?
Definition
the inability to use and comprehend words
Term
non-fluent aphasia is?
Definition
damage to the Broca's area; inability to properly form words
Term
what does damage/stroke to Wernicke's area do?
Definition
the person will still be able to speak but you will not be able to recgonize the words in a fluent fashion (aka fluent aphasia)
Term
specifically, the primary somatosensory area does what?
Definition
it pinpoints the part of the body where sensory arises
Term
the somatosensory association area of the association area does what?
Definition

integrates and interprets sensations (helps you determind exact shape, size, texture without looking)

 

Term
visual assocation area of the association area does what?
Definition
relates present and past visual experiences (allows to recognize something just by looking at it)
Term
auditory association area of the association area does what?
Definition
aka Wernicke's area: interprets meaning of speech by recognizing spoken words
Term
common integrative area of the association area does what?
Definition

it is the gnostic area and it receives impulses from other association areas to form a common thought

 

ex: looking at an apple- gnostic area gathers info about the apples color, taste, shape, size, smell

Term
the premotor area of the association area does what?
Definition
it deals with the learned motor activities of a complex and sequential nature; it serves as a bank for such movements
Term
the frontal eye field area of the association area does what?
Definition

is controls the voluntary scanning movements of the eyes

 

(ex: driving; reading)

Term
the language area of the association area does what?
Definition
it controls the muscles of the larynx and pharynx to enable one to speak
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