BPK 205 Chapter Notes -Postcentral Gyrus, Withdrawal Reflex, Anterior Grey Column

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Published on 1 Dec 2011
School
Simon Fraser University
Department
Biomedical Physio & Kines
Course
BPK 205
Professor
Practice Questions on Chapter 13 [There is some repetition of questions]
1. Describe the structure of a GTO. Draw and describe reflex connections of 1b
afferents. [~ 1 page of total writing + figures; make sure of the connections in the spinal
cord--what is in the intermediate zone and what is in the ventral horn]
GTO is located at junction between extrafusal fibers, and muscle tendon. It consists of
interwoven collagen fibers. It is innervated by a 1b afferent that becomes unmyelinated
once it enters the GTO capsule.
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As the muscle is contracted, the 1b afferent in the GTO is activated.
Action potential is sent to the spinal cord via the dorsal root.
It bifurcates. One pathway goes up via the dorsal column to the medulla
ipsilaterally and synapses; then travels contralaterally and synapses in the Ventro-
Posterior Lateral nucleus of the Thalamus. Third order neuron goes from VPL of
Thalamus to Areas 3, 2, 1 of the primary somatosensory cortex.
The second pathway travels into the gray matter of the spinal cord and divides in
the intermediate area. At least one branch will excite an antagonist muscle, while
others will inhibit agonist muscles. Interneurons for these connections are in the
intermediate region, but motoneurons they eventually synapse with will be
located in the ventral horn.
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2. Draw and describe the ascending connections of 1a and Ib afferents [< 0.3 page of
wring + a figure]
Pretty much the same??
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Document Summary

Practice questions on chapter 13 [there is some repetition of questions: describe the structure of a gto. Draw and describe reflex connections of 1b afferents. [~ 1 page of total writing + figures; make sure of the connections in the spinal cord--what is in the intermediate zone and what is in the ventral horn] Gto is located at junction between extrafusal fibers, and muscle tendon. One pathway goes up via the dorsal column to the medulla ipsilaterally and synapses; then travels contralaterally and synapses in the ventro- Thalamus to areas 3, 2, 1 of the primary somatosensory cortex: the second pathway travels into the gray matter of the spinal cord and divides in the intermediate area. At least one branch will excite an antagonist muscle, while others will inhibit agonist muscles. Pretty much the same: compare/contrast the ipsilateral spinal reflex connections from 1a, 1b and pain afferents. [~ 1 page of writing + three detailed figures. ]

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