Spinal cord

Question 1

Grey Matter

Answer 1

Shaped like a butterfly and contains neuron cell bodies

Question 2

White Matter

Answer 2

surrounds grey matter and contains axons running up and down the cord

Question 3

Ventral Horn

Answer 3

Contains motor neurons

Carries information from spinal cord to the muscle

Question 4

Dorsal Horn

Answer 4

Sensory Neurons
Carry sensory information from body to SC
Dorsal root ganglion contains sensory cell bodies

Question 5

Dorsal primary Rami

Answer 5

• Provide innervations to the skin of the dorsum of the body

- sensory info from the back to the SC. Also carry motor neurons to the deep back muscles

Question 6

Dorsal primary Rami (medial branch)

Answer 6

innervates skin from C7-T1

Question 7

Dorsal primary Rami (lateral branch)

Answer 7

innervates the skin T7-sacrum

Question 8

Ventral Primary Rami (VPR)

Answer 8

-provide innervation to the skin of the lateral and anterior part of the body
-receives 90% of cutaneous info
(Cervical, lumbar, and sacral VPR join within their groups to form a plexus)

Question 9

Cervical Plexus

Answer 9

• (VPR C1-C4) almost all of the muscles of the neck (no extensors)
• Skin, and posterior portion of the head

Question 10

Brachial Plexus

Answer 10

-(VPR C5-T1) Supplies to UE

Question 11

T2-T12

Answer 11

all separate nerves because the ribs keep them separate

Question 12

Lumbar Plexus

Answer 12

(L1-L4) innervation to lower extremity

Question 13

Sacral Plexus

Answer 13

(L5-S4) Supplies sciatic nerves and major nerves of the LE