Spinal Nerves

Question 1

How many spinal nerves are there? where do they originate?

Answer 1

31 pairs/spinal chord

Question 2

What is the function of spinal nerves?

Answer 2

mixed nerves/ two way communication

Question 3

What are the names of the spinal nerves? how many are there?

Answer 3

8 pr cervical (c1 to c8)
12 pr thorasic (t1 to t12)
5 pr lumbar (l1 to l5)
5 pr sacral (s1 to s5)
1 pr. coccygeal (c0)

Question 4

what do spinal nerves innervate?

Answer 4

somatic structures: skin and skeletal muscles of the body wall

Question 5

spinal nerves have two roots. what are they?

Answer 5

anterior or ventral root / posterior or dorsal root

Question 6

what are spinal nerves afferent and efferent to?

Answer 6

afferent to skin, efferent to muscle

Question 7

what is a ramus? what does each spinal nerve have? where do the rami go?

Answer 7

SN splits into two rami. Dorsal and ventral. the ventral rami go to extremities. The dorsal rami don’t.

Question 8

what does anterior part of SN innervate?

Answer 8

motor neurons / efferent

Question 9

what does posterior part of SN innervate?

Answer 9

afferents