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Medsci 142 Comprehensive Exam Questions And Complete Answers.
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dermatome - Answer area which each nerve from the spinal cord goes to how many dermatomes? - Answer 30. despite 31 pairs as C1 doesn't reach the skin. discriminative sensation - Answer touch and pressure sensations. from the peripheral receptors they are myelinated by swhann cells. t...

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  • October 28, 2024
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Medsci 142 Comprehensive Exam
Questions And Complete Answers.
dermatome - Answer area which each nerve from the spinal cord goes to



how many dermatomes? - Answer 30. despite 31 pairs as C1 doesn't reach the skin.



discriminative sensation - Answer touch and pressure sensations. from the peripheral receptors they
are myelinated by swhann cells. travel 50ms-1. From an "onion" of connective tissue". Travel past root
ganglion (containing cell body) and divide to brain and spinal cord.



meissner corpuscle discriminative - Answer nerves for touch sensations



pacinian corpuscles discriminative - Answer nerves for pressure sensations



pain and temperature - Answer non-encapsulated nerve endings. non-discriminative: pain and temp is
not localised



cervical nerves - Answer 8 pairs



thoracic nerves - Answer 12 pairs



lumbar nerves - Answer 5 pairs



sacral nerves - Answer 5 pairs



coccygeal nerves - Answer 1 pair



dorsal root ganglion - Answer cluster of cell bodies which contain nuclei and organelles. supports the
health of the neuron by creating enzymes and realising neurotransmitters.

, function is to relay sensory information from peripheral nerves to CNS.



peripheral nerve fibre fork - Answer for touch and pressure the nerve divides, one to the brain, the
other to the spinal chord. For pain and temperature, the nerve enters the spinal chord and to the lower
motor neuron therefore reflex actions can occur quickly. (we move without even thinking it when
touching something hot).



non-discriminative sensation - Answer pain and temperature sensations. non-myelinated. nerve
impulses travel at 1ms-1 past root ganglion to dorsal grey horn.



anatomy of the spine - Answer made up of verterbrae and intervertebral discs which help absorb shock



spinal meninges - Answer layers of connective tissue which surround the spinal chords

1) pia mater (inner layer)

2) arachnoid mater (middle layer)

3) dura mater (outer layer)



spinal cord anatomy - Answer spinal cord contains bundle of nerves fibres within the spinal canal
(spinal meninges)



spinal nerves - Answer body has 31 spinal nerves, and each nerve innervates a specific area of skin
known as dermatomes. Only 30 dermatomes as the C1 does not innervate the skin.



lower motor neurons - Answer have cell bodies in brain stem and spinal cord.



from brain steam, LMN axons extend through cranial nerves to innervate muscles of the face and head.



from spinal cord, LMN axons extend through spinal cords to innervate muscles of the limbs and trunk



Upper motor neurons - Answer Upper motor neurons synapse with local circuit neurons which in turn
synapse with lower motor neurons.

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