Arm (Brachium)

Question 1

name the muscles of the anterior compartment of the arm

Answer 1

biceps brachii
coracobrachialis
brachialis

Question 2

what nerve innervates the muscles of the anterior compartment of the arm?

Answer 2

musculocutaneous n

Question 3

name the muscles of the posterior compartment of the arm

Answer 3

triceps brachii

Question 4

what nerve innervates the muscles of the posterior compartment of the arm?

Answer 4

radial n

Question 5

the medial intermuscular septum of the arm contains what structures?

Answer 5

median n
ulnar n
brachial a

Question 6

the lateral intermuscular septum contains what structures?

Answer 6

radial n
profunda brachii a

Question 7

origin of biceps brachii

Answer 7

long head: supraglenoid tubercle of scapula
short head: coracoid process of scapula

Question 8

insertion of biceps brachii

Answer 8

radial tuberosity

Question 9

innervation & spinal level of biceps brachii

Answer 9

musculocutaneous n (C6)

Question 10

actions of biceps brachii

Answer 10

1. forearm supination
2. simple forearm flexion when elbow extended and forearm supinated
3. long head = stabilizer of glenohumeral joint

Question 11

what nerve root is associated with the deep tendon reflex of biceps brachii?

Answer 11

C5

Question 12

origin & insertion of coracobrachialis

Answer 12

O: coracoid process, scapula
I: medial surface of middle humerus

Question 13

innervation & spinal levels of coracobrachialis

Answer 13

musculocutaneous n (C6)

Question 14

action of coracobrachialis

Answer 14

flex & adduct humerus at glenohumeral joint

Question 15

origin & insertion of brachialis

Answer 15

O: distal half of anterior humerus (where coracobrachialis ends)
I: ulnar tuberosity & anterior surface of coronoid process

Question 16

innervation & spinal levels of brachialis

Answer 16

musculocutaneous n (C6, sometimes C7 from radial n)

Question 17

action of brachialis

Answer 17

• flex forearm at elbow in any position
• controlled relaxation during extension of forearm to gently place object down

Question 18

musculocutaneous nerve lies deep to ____ and superficial to ____

Answer 18

biceps brachii
brachialis

Question 19

peripheral entrapment sites of musculocutaneous n

Answer 19

1. coracobrachialis (n pierces through)
2. space between biceps brachii & brachialis

Question 20

symptoms of peripheral entrapment of musculocutaneous n

Answer 20

• lateral forearm paresthesia (occurs first)
• weak supination & flexion

Question 21

peripheral entrapment sites of lateral antebrachial cutaneous n

Answer 21

biceps brachii & brachialis (where it exits)

Question 22

symptoms of peripheral entrapment of lateral antebrachial cutaneous n

Answer 22

lateral forearm paresthesia without weakness (no motor function here)

Question 23

name the 3 branches off the brachial artery

Answer 23

profunda brachii a
superior ulnar collateral a
inferior ulnar collateral a

Question 24

the brachial artery is a continuation of the ____ after it passes the ____

Answer 24

axillary a
teres major

Question 25

the artery that runs with the radial nerve is the ____

Answer 25

profunda brachii a

Question 26

the artery that branches off the middle of the brachial artery and runs with the ulnar nerve is the ____

Answer 26

superior ulnar collateral a

Question 27

superior ulnar collateral artery runs with what nerve?

Answer 27

ulnar n

Question 28

superior ulnar collateral artery anastomoses with ____

Answer 28

posterior ulnar recurrent a (superior ulnar collateral a runs with ulnar n through groove on posterior side)

Question 29

radial collateral artery anastomoses with ____

Answer 29

radial recurrent a

Question 30

what artery runs anterior to the medial epicondyle?

Answer 30

inferior ulnar collateral a

Question 31

inferior ulnar collateral artery anastomoses with ____

Answer 31

anterior ulnar recurrent a

Question 32

the brachial artery runs with what nerve?

Answer 32

median n

Question 33

origins of triceps brachii

Answer 33

long: infraglenoid tubercle, scapula lateral: posterolateral surface of humerus & lateral intermuscular septum medial: posteromedial surface of humerus & medial intermuscular septum

Question 34

insertion of triceps brachii

Answer 34

olecranon process, ulna

Question 35

innervation & spinal levels of triceps brachii

Answer 35

radial n C7, C8

Question 36

actions of triceps brachii

Answer 36

- extend forearm at elbow - long head stabilizes GH joint and extends humerus at GH joint

Question 37

triceps brachii is associated with what nerve root reflex?

Answer 37

C7

Question 38

moving proximally up the arm, the brachial vein dumps into the ____ vein, which then dumps into the ____ vein

Answer 38

basilic v axillary v (crosses teres major)

Question 39

moving proximally up the arm, the cephalic vein passes through the ____ and dumps into the ____ vein

Answer 39

deltopectoral triangle axillary v

Question 40

the cephalic vein runs along the ____ side of the arm

Answer 40

lateral

Question 41

the basilic vein runs along the ____ side of the arm

Answer 41

medial

Question 42

the basilic vein runs with what nerve superficial to the cubital fossa?

Answer 42

medial antebrachial cutaneous n

Question 43

what vein connects the cephalic to the basilic vein?

Answer 43

median cubital vein

Question 44

the cephalic vein runs with what nerve superficial to the cubital fossa?

Answer 44

lateral antebrachial cutaneous n

Question 45

what structure forms the floor of the cubital fossa?

Answer 45

tendon of brachialis m

Question 46

what structure forms the base of the cubital fossa?

Answer 46

line between lateral and medial epicondyles

Question 47

what structure forms the roof of the cubital fossa?

Answer 47

bicipital aponeurosis

Question 48

what structure forms the lateral border of the cubital fossa?

Answer 48

brachioradialis m

Question 49

what structure forms the medial border of the cubital fossa?

Answer 49

pronator teres m

Question 50

what are the contents of the cubital fossa?

Answer 50

brachial v median n brachial a

Question 51

describe the orientation of the radial nerve through the upper arm

Answer 51

begins posterior, runs posterolateral, then anterolateral along spiral groove of humerus

Question 52

the radial nerve separates what 2 muscles lateral to the cubital fossa?

Answer 52

brachioradialis & brachialis

Question 53

describe the path of the radial nerve as it approaches the cubital fossa

Answer 53

travels lateral to cubital fossa, branches into deep & superficial branches of radial n

Question 54

name the potential entrapment sites of the radial nerve in the arm

Answer 54

- at the spiral groove - between brachioradialis & brachialis