2.4 Spinal Nerve (II)

Question 1

Where do the nerves for the upper extremities branch off from?

Answer 1

brachial plexus

Question 2

What vertebra do the spinal nerves that make up the brachial plexus come from?

Answer 2

C5-T1

Question 3

What combines to form the roots of the brachial plexus?

Answer 3

ventral Rami from C5-T1

Question 4

What are the three trunks of the brachial plexus?

Answer 4

superior
middle
inferior

Question 5

What do the trunks of the brachial plexus form?

Answer 5

anterior and posterior divisions

Question 6

What do the anterior and posterior divisions of the brachial plexus form?

Answer 6

branch into three cords: lateral, posterior, and middle

Question 7

What do the cords of the brachial plexus terminate in?

Answer 7

five major branches:
musculocutaneous nerve, axillary nerve, median nerve, radial nerve, ulnar nerve

Question 8

What are the “extra” nerves that come off the brachial plexus and supply sensory and motor information?

Answer 8

long thoracic nerve
suprascapular nerve
pectoral nerve
thoracodorsal nerve

Question 9

What muscles does the axillary nerve supply?

Answer 9

deltoid
teres minor
long head of the triceps brachii

Question 10

What information does the axillary nerve carry from the shoulder joint?

Answer 10

sensory

Question 11

What muscles does the radial nerve supply?

Answer 11

triceps brachii
twelve muscles in the forearm that control wrist and finger extension

Question 12

Where does the radial nerve carry sensory information from?

Answer 12

associated joints in the arm and the overlying skin of the forearm

Question 13

What track does the radial nerve follow?

Answer 13

posterior surface of the humerus and wraps around the anterior surface close to the elbow joint

Question 14

What does the median nerve supply?

Answer 14

flexor muscles of the forearm and skin of the first three and a half fingers

Question 15

Where does the median nerve travel?

Answer 15

medially on the anterior surface of the elbow

Question 16

What does the ulnar nerve supply?

Answer 16

part of the flexor muscles of the forearm, wrist, and hand as well as the skin of half the ring finger and pinky finger

Question 17

Where does the ulnar nerve travel?

Answer 17

posteriorly behind the medial side of the elbow

Question 18

What is the musculocutaneous nerve responsible for?

Answer 18

flexor muscles of the arm including the biceps brachii and brachialis

Question 19

Where does the musculocutaneous nerve travel?

Answer 19

radial side of the forearm

Question 20

Where does the lumbar plexus nerves arise from?

Answer 20

ventral Rami of T12-L4