Spinal Nerves and Cranial Nerves Flashcards Preview

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Flashcards in Spinal Nerves and Cranial Nerves Deck (25):
1

What is the function of dorsal roots

carry sensory information into the CNS

2

What is the function of ventral roots

carry motor information out of the CNS

3

What is the function of spinal nerves

carry both sensory and motor information

4

Where are sensory neuron cell bodies located?

dorsal root ganglion

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

Nerve plexus

6

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

brachial lumbar and sacral plexuses

7

What does the brachial plexus innervate?

Pectoral girdle and upper extremity

8

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

C5-T1

9

What are the 5 terminal branches of the upper extremity?

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

10

What is the distribution of the axillary nerve

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

11

What is the distribution of the radial nerve

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

12

What is the distribution of the musculocutaneous nerve

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

13

What is the distribution of the median nerve

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

14

What is the distribution of the ulnar nerve

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

15

What does the lumbar plexus innervate

the pelvic girdle and lower extremity

16

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

L1-L4

17

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

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

18

What is the distribution of the femoral nerve

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

19

What is the distribution of the obturator nerve

Adductors of hip; skin over medial surface of thigh

20

What does the sacral plexus innervate

pelvic girdle and lower extremity

21

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

L4-S4

22

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

Gluteal, sciatic, pudendal, posterior femoral cutaneous

23

What is the distribution of the sciatic nerve

hamstrings

24

What is the distribution of the tibial nerve

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

25

What is the distribution of the fibular nerve

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)