Spinal Nerves and Cranial Nerves

Question 1

What is the function of dorsal roots

Answer 1

carry sensory information into the CNS

Question 2

What is the function of ventral roots

Answer 2

carry motor information out of the CNS

Question 3

What is the function of spinal nerves

Answer 3

carry both sensory and motor information

Question 4

Where are sensory neuron cell bodies located?

Answer 4

dorsal root ganglion

Question 5

During development, spinal nerves combine to innervate peripheral tissues (e.g., skin, muscle) producing a series of compound nerve trunks that form a complex interwoven network called a

Answer 5

Nerve plexus

Question 6

The most notable examples are the plexuses innervating the upper and lower extremities

Answer 6

brachial lumbar and sacral plexuses

Question 7

What does the brachial plexus innervate?

Answer 7

Pectoral girdle and upper extremity

Question 8

What spinal nerve roots are the primary contributors to the brachial plexus?

Answer 8

C5-T1

Question 9

What are the 5 terminal branches of the upper extremity?

Answer 9

Musculocutaneous n, axillary n, radial n, median n, ulnar n

Question 10

What is the distribution of the axillary nerve

Answer 10

deltoid and teres minor muscles, sensory from the skin of the shoulder

Question 11

What is the distribution of the radial nerve

Answer 11

extensor muscles on the arm and forearm, sensory from skin over the posterolateral surface of the limb

Question 12

What is the distribution of the musculocutaneous nerve

Answer 12

Flexor muscles on the arm, sensory from skin over lateral surface of the forearm

Question 13

What is the distribution of the median nerve

Answer 13

Flexor muscles on the forearm, sensory from skin over anterolateral surface of the hand

Question 14

What is the distribution of the ulnar nerve

Answer 14

Flexor carpi ulnaris muscle, flexor digitorum profundus muscle, adductor pollicis muscle, and small digital muscles by the deep branch; sensory from skin over medial surface of the hand

Question 15

What does the lumbar plexus innervate

Answer 15

the pelvic girdle and lower extremity

Question 16

What spinal nerve roots are the primary contributors to the lumbar plexus

Answer 16

L1-L4

Question 17

What are the 6 terminal branches around the pelvic girdle in the lower extremity of the lumbar plexus

Answer 17

iliohypogastric, ilioinguinal, lateral femoral cutaneous, genitofemoral, femoral, obturator

Question 18

What is the distribution of the femoral nerve

Answer 18

Anterior muscles of thigh; skin over anteromedial surface of thigh, medial surface of leg and foot

Question 19

What is the distribution of the obturator nerve

Answer 19

Adductors of hip; skin over medial surface of thigh

Question 20

What does the sacral plexus innervate

Answer 20

pelvic girdle and lower extremity

Question 21

What spinal nerve roots are the primary contributors to the sacral plexus

Answer 21

L4-S4

Question 22

What are the 4 terminal branches around the pelvic girdle in the lower extremity of the sacral plexus

Answer 22

Gluteal, sciatic, pudendal, posterior femoral cutaneous

Question 23

What is the distribution of the sciatic nerve

Answer 23

hamstrings

Question 24

What is the distribution of the tibial nerve

Answer 24

flexors of knee and extensors(plantar flexors) of ankle; flexors of toes; skin over posterior surface of leg, plantar surface of foot

Question 25

What is the distribution of the fibular nerve

Answer 25

tibialis anterior muscle; extensor of toes; skin over anterior surface of leg and dorsal of foot; skin over lateral portion of foot (through the sural nerve)