Somatic afferent system

Question 1

what do primary afferent neurons innervate?

Answer 1

somatic structures as well as visceral structures (gut, heart, bladder(

Question 2

where are afferent system neurons located?

Answer 2

dorsal or spinal ganglia

Question 3

What two types of sensations do spinal ganglia neurons convey?

Answer 3

exteroceptive and proprioceptive

Question 4

exteroceptive

Answer 4

pain, temperature, touch and pressure

Question 5

proprioceptive

Answer 5

subsconscious providing information about joint position and tendon/muscle tension

Question 6

How are DRG neurons pseudounipolar?

Answer 6

they have a stem axon which bifurcates into two long axonal branches. The peripheral branch DRG axon is located in spinal nerves and their named branches The central branch DRG axon is found only in the dorsal roots which enter the spinal cord and may ascend to higher levels.

Question 7

how is somatic afferent system organized?

Answer 7

segmentally into dermatomes, which represent sensory territory on the body surface of DRG neurons from a given spinal nerve level.

Question 8

which spinal nerve does not have a dermatome?

Answer 8

C1

Question 9

how are dermatomes on the back innervated? on the anterior side?

Answer 9

back: innervated by sensory axons traveling in the dorsal rami. anterior by sensory axons in ventral rami.