Spinal Nerves

Question 1

Networks of nerves serving motor and sensory needs of the limbs.

Answer 1

Plexus

Question 2

Plexuses form from the ventral rami of spinal nerves of what regions?

Answer 2

Cervical, lumbar, and sacral regions.

Question 3

What are the four plexuses?

Answer 3

Cervical, brachial, lumbar, and sacral

Question 4

What is the origin of the cervical plexus?

Answer 4

C1-C5

Question 5

What is the origin of the brachial plexus?

Answer 5

C5-C8; T1

Question 6

What is the origin of the lumbar plexus?

Answer 6

L1-L4

Question 7

What is the origin of the sacral plexus?

Answer 7

L4-L5; S1-S4

Question 8

This important nerve of the cervical plexus serves the diaphragm, skin and muscles of shoulder and neck.

Answer 8

Phrenic

Question 9

What are the important nerves of the brachial plexus?

Answer 9

Axillary, radial, median, musculocutaneous, ulnar

Question 10

What are the important nerves of the lumbar plexus?

Answer 10

Femoral (including lateral and anterior cutaneous branches) and obturator

Question 11

What are the important nerves of the sacral plexus?

Answer 11

Sciatic, common fibular (superior and deep branching), tibial (sural and plantar branches), superior and inferior gluteal

Question 12

This brachial nerve serves the deltoid muscle and skin of shoulder, muscles and skin of superior thorax.

Answer 12

Axillary

Question 13

This brachial nerve serves the triceps and extensor muscles of the forearm, skin of posterior upper limb.

Answer 13

Radial

Question 14

This brachial nerve serves the flexor muscles and skin of forearm ad some muscles of hand.

Answer 14

Median

Question 15

This brachial nerve serves the flexor muscles of arm, and skin of lateral forearm.

Answer 15

Musculocutaneous

Question 16

This brachial nerve serves some flexor muscles of forearm, wrist and many hand muscles, skin of hand.

Answer 16

Ulnar

Question 17

This lumbar nerve serves the lower abdomen, anterior and medial thigh muscles, and skin of anteromedial leg and thigh.

Answer 17

Femoral

Question 18

This lumbar nerve serves the adductor muscles of medial thigh and small hip muscles, skin of medial thigh and hip part.

Answer 18

Obturator

Question 19

This nerve is the largest nerve in the body.

Answer 19

Sciatic

Question 20

The sciatic nerve splits into what two nerves?

Answer 20

Common fibular and tibial

Question 21

This sacral nerve serves the lower trunk and posterior surface of thigh.

Answer 21

Sciatic

Question 22

This sacral nerve serves the lateral aspect of the leg and foot.

Answer 22

Common fibular

Question 23

This sacral nerve serves the posterior aspect of the leg and foot.

Answer 23

Tibial

Question 24

This sacral nerve serves the gluteal muscles of hip.

Answer 24

Superior and inferior gluteal

Question 25

Damage to this nerve results in respiratory paralysis (death if not treated promptly).

Answer 25

Phrenic

Question 26

Damage to this nerve results in paralysis and atrophy of deltoid muscle.

Answer 26

Axillary

Question 27

Damage to this nerve results in wristdrop (inability to extend hand at wrist).

Answer 27

Radial

Question 28

Damage to this nerve results in decreased ability to flex and abduct hand & flex and abduct thumb and index finger (inability to pick up small objects).

Answer 28

Median

Question 29

Damage to this nerve results in decreased ability to flex forearm on arm.

Answer 29

Musculocutaneous

Question 30

Damage to this nerve results in clawhand (inability to spread fingers apart).

Answer 30

Ulnar

Question 31

Damage to this nerve results in inability to extend leg & flex hip (loss of cutaneous sensation).

Answer 31

Femoral

Question 32

Damage to this nerve results in inability to adduct thigh.

Answer 32

Obturator

Question 33

Damage to this nerve results in inability to extend hip & flex knee; sciatica.

Answer 33

Sciatic

Question 34

Damage to this nerve results in footdrop (inability to dorsiflex foot).

Answer 34

Common fibular

Question 35

Damage to this nerve results in inability to plantar flex and invert foot; shuffling gait.

Answer 35

Tibial

Question 36

Damage to this nerve results in inability to hip (maximus) or abduct & medially rotate thigh (medius).

Answer 36

Superior and inferior gluteal