Arm and Elbow

Question 1

origin of long head of the biceps brachii

Answer 1

supraglenoid tubercle of the scapula

Question 2

origin of short head of the biceps brachii

Answer 2

coracoid process of the scapula

Question 3

insertion of the biceps brachii

Answer 3

radial tuberosity

Question 4

innervation of the biceps brachii

Answer 4

musculocutaneous n. (C5-C6)

Question 5

action of the biceps brachii

Answer 5

elbow joint: flexion, supination*
shoulder joint: flexion, stabilization of humeral head during deltoid contraction, abduction and internal rotation of the humerus

Question 6

origin of brachialis

Answer 6

distal half of anterior surface of the humerus

Question 7

insertion of brachialis

Answer 7

ulnar tuberosity

Question 8

innervation of brachialis

Answer 8

musculocutaneous n. (C5-C6) and radial n. (C7, minor)

Question 9

action of brachialis

Answer 9

flexion at the elbow joint

Question 10

origin of long head of the biceps brachii

Answer 10

infraglenoid tubercle

Question 11

origin of medial head of the triceps brachii

Answer 11

posterior humerus, inferior to radial groove, medial intermuscular septum

Question 12

origin of lateral head of the triceps brachii

Answer 12

posterior humerus, proximal to radial groove, lateral intermuscular septum

Question 13

insertion of triceps brachii

Answer 13

olecranon process of ulna

Question 14

innervation of triceps brachii

Answer 14

radial n. (C6-C8)

Question 15

action of triceps brachii

Answer 15

elbow joint: extension

shoulder joint, long head: extension and adduction

Question 16

origin of coracobrachialis

Answer 16

coracoid process of the scapula

Question 17

insertion of coracobrachialis

Answer 17

humerus, in line with the crest of the greater tubercle

Question 18

innervation of coracobrachialis

Answer 18

musculocutaneous n. (C5-C7)

Question 19

action of coracobrachialis

Answer 19

flexion, adduction, internal rotation

Question 20

the annular ligament is made up of what?

Answer 20

articular cartilage

Question 21

which ligament blends into the annular ligament?

Answer 21

radial/lateral collateral ligament

Question 22

which ligament wraps around the head of the radius?

Answer 22

annular ligament

Question 23

what are the 3 bands of the ulnar/medial collateral ligament?

Answer 23

anterior, posterior, oblique

Question 24

In what motion is the anterior band of the ulnar collateral ligament taut?

Answer 24

extension

Question 25

In what motion is the posterior band of the ulnar collateral ligament taut?

Answer 25

flexion

Question 26

what stress does the radial collateral ligament stabilize against?

Answer 26

varus stress (adduction/medial)

Question 27

what stress does the ulanr collateral ligament stabilize against?

Answer 27

valgus stress (application of force from lateral side/ abduction)

Question 28

what is the importance of brachial artery?

Answer 28

controls blood pressure

Question 29

boundaries of the cubital fossa?

Answer 29

medial - pronator teres lateral - brachioradialis floor - brachilais and supinator roof - brachial and antebrachial fascia

Question 30

origin of brachioradialis

Answer 30

lateral supracondylar ridge of the humerus

Question 31

insertion of brachioradialis

Answer 31

styloid process of radius

Question 32

innervation of brachioradialis

Answer 32

radial n.

Question 33

action of brachioradialis

Answer 33

flexion of elbow (in neutral)