Typical Spinal Nerve

Question 1

31 pairs of spinal nerves

Answer 1

8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal

Question 2

dorsal and ventral roots meet within the _________

Answer 2

intervertebral foramen

Question 3

the typical spinal nerve

Answer 3

once the dorsal and ventral roots come together and we pass the intervertebral foramen

Question 4

length of typical spinal nerve

Answer 4

1-3mm

Question 5

what happens as the spinal nerve exists the intervertebral foramen

Answer 5

it bifurcates into ventral and dorsal rami

Question 6

foramen

Answer 6

what forms when dorsal and ventral roots come together

Question 7

dorsal root

Answer 7

arise from unipolar neurons in spinal ganglia on dorsal root, contain only SENSORY fibers, carry fibers from periphery (skin, muscle, and joint receptors) to CNS

Question 8

ventral root

Answer 8

arise from grey matter in spinal cord, contains only MOTOR fibers, carries fibers to skeletal muscle and non striated muscle and glands (autonomic function)

Question 9

dorsal root ganglion

Answer 9

collection of cell bodies/nerves outside of the CNS

Question 10

spinal nerve

Answer 10

contains both motor and sensory fibers

Question 11

ventral and dorsal rami

Answer 11

contain both sensory and motor fibers

Question 12

dermatome

Answer 12

area of skin supplies with sensory nerve fibers by a SIGNLE DORSAL nerve root and its corresponding spinal nerve, dermatomes of adj. spinal nerves overlap esp. in the thoracic region

Question 13

myotome

Answer 13

group of muscles innervated by a single ventral root and corresponding spinal nerve

Question 14

sclerotome

Answer 14

an area of bone innervated by a SINGLE DORSAL nerve root and corresponding spinal nerve

Question 15

denervation

Answer 15

lack of innervation or lack or nerve supply