Spinal Nerve

Question 1

Answer 1

Dura mater

Question 2

what is this?

what fibers is it composed of?

Answer 2

ventral root

somatic motor, pregang sym, pregang sym

Question 3

Answer 3

denticulate ligament

you can tell dorsal root is “on top of it”

ventral root is “below it”

Question 4

Answer 4

conus medularris

“medullary cone”

cone-shaped inferior end of the spinal cord; located at vertebral level L1

Question 5

what is this?

what is this an extension of?

Answer 5

filum terminale

thread-like extension of the pia mater from the conus medullaris of the spinal cord

Question 6

Answer 6

cauda equina

dorsal and ventral roots

dorsal and ventral roots of all spinal nerves inferior to L1

Question 7

What has cell bodies in dorsal root ganglia?

What is significant about dorsal root ganglia

Answer 7

somatic sensory

visceral afferents (both types)

No synapses occur here, dorsal and ventral roots of all spinal nerves inferior to L1

Question 8

identify.

what fibers are in yellow?

what does yellow supply?

Answer 8

red: dorsal ganglia
yellow: dorsal rami

*SMALLER THAN VENTRAL RAMI

fibers in dorsal rami: somatic sensory, somatic motor, pregang symp

supply both motor and sensory fibers to the bones, muscles, and skin of the posterior neck and trunk

Question 9

Answer 9

ventral rami

*larger than dorsal rami..on bottom of prosection

somatic sensory, somatic motor, pregang sym

what supplies the bones, muscles and skin of the anterior thoracic and abdominal walls and extremities.

to skeletal mm. of the neck, trunk and extremities; sympathetic innervation to the skin

general sense (touch, pressure, pain, heat, cold, etc.) to the skin of the trunk (except the back) and extremities; visceral pain via the white rami of the sympathetic nervous system (T1-L2)