Arm & Cubital fossa - lectures

Question 1

anterior compartment innervated mostly by this n. except

Answer 1

mostly by median except FCU and ulnar half of FDP (ulnar n.)

Question 2

nerve supplying all muscles arising in posterior compartment

Answer 2

deep radial n.

Question 3

primary supinator of forearm (when elbow is flexed)

Answer 3

biceps

Question 4

primary flexor of forearm

Answer 4

brachialis

Question 5

gunshot to right shoulder region
patient weak in ability to flex shoulder joint
unable to flex elbow
forearm appears to be in a pronated position
what nerve damages?

Answer 5

musculocutaneous nerve

Question 6

anterior arm compartment muscles and nerves

Answer 6

• biceps brachii (short head and long head)
• brachialis
• coracobrachialis
  N - musculocutaneous n.

Question 7

biceps brachiii attaches to radial tuberosity and fascia of forearm via

Answer 7

bicipital aponeurosis

Question 8

biceps brachi ABI

Answer 8

A: supinates forearm, when supine will flex forearm
- resists dislocation of shoulder (short head)
B: brachial a.
I: mc n. (C5,C6)

Question 9

coracobrachialis ABI

Answer 9

A: flexes and adducts arm at shoulder joint.
- resists dislocation of shoulder joint
B: brachial a.
I: mc n. (C5,6,7)

Question 10

brachialis ABI

Answer 10

A: flexes forearm at elbow joint
B: brachial a.
I:mc n. (C5,C6,7)
- lateral portions may receive radial n. contributions

Question 11

patient shows up in ER late sunday afternoon: holding right arm close to body, craling elbow iwth hand, right shirt sleeve bloody - bone fragment protruding where hes holding his limb
-inability to extend wrist and fingers
- relaxed wrist in partially flexed position when unable to let arm hang free
what n. injured and where in its course?

Answer 11

saturday night palsy!

radial nerve injured in the brachial region at spiral groove..

Question 12

posterior arm muscles and nerve

Answer 12

triceps bachii (long head, lateral head, medial head)
anconeus
radial n.

Question 13

anconeus ABI

Answer 13

from lateral epicondyle to olecranon of ulna
actions: assists triceps in extension of forearm
- stabilizes elbow joint
-abducts ulna during pronation
B: deep brachial a.
I: radial n. (C7,C8, T1)

Question 14

triceps brachii ABI

Answer 14

A: extends forearm at elbow joint (main)
- resists dislocation of shoulder joint (long head)
B: deep brachial a.
I: radial n. (C6,C7, C8)

Question 15

lateral antebrachial cutaneus nerve is the terminal branch of

Answer 15

musculocutaneous n.

Question 16

boundaries of cubital fossa

Answer 16

lateral: brachioradialis
medial: pronator teres
superior: imaginary line between medial and lateral epicondyles of humerus
roof: skin, superficial and deep fascia, bicipital aponeurosis
floor: supinator and brachialis

Question 17

contents of cubital fossa

Answer 17

median nerve
bifurcation of radial and ulnar arteries
brachial veins (venae comitantes)
tendon of biceps brachii and bicipital aponeurosis
radial nerve (deep radial nerve and superficial radial nerve)

Question 18

posterior to cubital region: elbow region contents

Answer 18

triceps and olecranon process
anconeus
ulnar n. runs posterior to medial epicondyle of humerus (“funny bone”)
posterior ulnar reccurent artery.

Question 19

brachial artery anastamoses with the

Answer 19

ulnar artery

Question 20

deep brachial artery anastamoses with the

Answer 20

radial and interosseous arteries