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Test 4 Lombrana notes on Lecture 14 part 2
spinal cord (8) self made notes/?
36
Anatomy
Undergraduate 1
11/07/2009

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Term
gray matter of the spinal cord has what purpose?
Definition
receives and integrates incoming and outgoing info
Term
what tracts propagate impulses from sensory receptors up the spinal cord to the brain
Definition
sensory (ascending) tracts propagate
Term
what pathway are sensory and motor tracts
Definition
they are part of the somatic sensory pathway
Term
what tracts propagate impulses from the brain?
Definition
motor (descending) tracts propagate impulses, towards effectors
Term
what are the 2 main routes nerve impulses propate?
Definition
they propagate up the spinal cord via, the posterior column medial lemniscus pathway
and the spinothalamic tracts
Term
what are spinothalamic tracts?
Definition
spinothalamic tracts (anterolateral) are composed of thousand of sets of 3 neurons (1st,2nd & 3rd order)
Term
what is the purpose of the lateral spinothalmaic tract
Definition
conveys sensory impulses for pain and temperature
Term
what is the purpose of anterior spinnothalamic tract
Definition
conveys impulses for tickle, itch crude touch pressure vibrations
Term
what are the 2 tracts of the posterior columns
Definition
gracile fasiculus and cuneate fasiculus
Term
the posterior columns carry impulses for ?
Definition
touch, pressure, sensation
Term
proprioception
Definition
perception of the position of body parts, esp the limbs, independent of vision
Term
discriminitie touch
Definition
recognition of the location, shape, size and texture of mechanical obj that contact skin
Term
2-pt discrimination
Definition
the ability to discern that 2 nearby objectstouching the skin are 2 distinct pts
Term
a pathway in the posterior columns is ______
Definition
posterior colummn-medial lemniscus pathway
Term
a ribbon-like tract that extends from the medulla to the thalamus
Definition
medial lemniscus
Term
the abillity to recognize size shape and texture of an object by touching
Definition
stereognosis
Term
conduct impulses from the brain (primary motor region to skeletal muscle)
Definition
somatic motor tracts (descending)
Term
two types of descending pathways
Definition
direct pathways (pyramidal) and indirect (extrapyramidal) pathways
Term
what do direct (pyramidal) pathways do?
Definition
convey impulses that originate in the cerebral cortex, cause precise voluntary movements
Term
provide input to lower motor neurons, innervate skeletal muscles, upper motor neurons end in gray horn on same side
Definition
lateral corticospinal tract
Term
what does the indirect(extrapyramidal) pathway include
Definition
rubrospinal, tectospinal and vestibulospinal tracts
Term
convey impulses from the brain stem and other parts of the brain
Definition
indirect (extrapyramidal) pathways
Term
what does the indirect (extrappyramidal) pathway do?
Definition
maintain skeletal muscle tone and contraction of postural muscles, role in equilibruium by regulating muscle tone in response to head movements, he3lp coordinate body movements with visual stimuli
Term
a fast involuntary unplanned sequence of actions in repsponse to a stimulus
Definition
reflex
Term
types of reflexes
Definition
spinal, cranial, somatic
Term
integration takes place in the gray matter ______ reflex
Definition
spinal reflex
Term
integration occurs in the brainstem, ____ reflexes
Definition
cranial reflexes
Term
involves contraction of the skeletal muscles, _______ reflexes
Definition
somatic reflexes
Term
not consciosly perceived, responses of smooth muscle, cardiac and glands, ____ reflexes
Definition
autonomic (visceral) reflexes
Term
5 functional components of a reflex arc
Definition
sensory receptor, sensory neuron, integrating center, motor neuron, effector
Term
responds to stimuli by producing an action potential, _____
Definition
sensory receptor
Term
propagates the impulse to the gray matter of the spinal cord or brain stem, _______
Definition
sensory neuron
Term
one or more regions of gray matter in the CNS _______
Definition
integrating center
Term
a single synapse between a sosory neuron and a motor neuron
Definition
monosynaptic reflex arc
Term
involves more than 2 types of neurons and more than one cns synapse
Definition
polysynaptic reflex arc
Term
carries the impulse triggered by the integrating center out of the cns to the responding part
Definition
motor neuron
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