functional neuroanatomy of sensation W4

Question 1

free nerve endings in the skin sense what?

Answer 1

pain/temperature

Question 2

merkel endings in the skin sense what?

Answer 2

touch/pressure

Question 3

meissners corpuscle in the skin senses what?

Answer 3

fine touch (esp conc in fingertips)

Question 4

peripheral nerve anatomy

Answer 4

epineurium surrounds entire nerve
perineurium surrounds bundles of nerve fibres
endoneurium between nerve fibres

Question 5

neural pathway for pain and temperature?

Answer 5

1st order neuron synapses on entry to the spinal cord in the dorsal horn
decussation immediately
2nd order neuron ascends in spinothalamic tract
final synapse in thalamus
3rd order neuron ascends to cortex

Question 6

neural pathway for touch, proprioception and vibration?

Answer 6

1st order neuron enters cord
ascends via ipsilateral dorsal column pathway
synapse in medulla
then decussation in medial lemniscus
ascends as 2nd order neuron
final synapse in thalamus
ascent to sensory cortex

Question 7

facial sensation - innervated by which nerve? what else does it innervate?

Answer 7

trigeminal nerve
oral cavity, nostrils, sclera, dura

Question 8

where does the ophthalmic division of the trigeminal nerve supply?

Answer 8

forehead
top of skull
eye
tip of nose

Question 9

where does the maxillary division of the trigeminal nerve supply?

Answer 9

cheek
nostrils
upper lip

Question 10

where does the mandibular division of the trigeminal nerve supply?

Answer 10

jaw, bottom lip

Question 11

where do the three branches of the trigeminal nerve group together

Answer 11

trigeminal ganglion