Muscles of the arm

Question 1

the three anterior compartments of the arm

Answer 1

• biceps brachii
• coracobrachialis
• brachialis

Question 2

Innervation of the anterior compartment of the arm

Answer 2

musculocutaneous nerve

Question 3

Long head of biceps brachii origin

Answer 3

superglenoid tubercle of scapula

Question 4

short head of biceps brachii origin

Answer 4

coracoid process of scapula

Question 5

insertion of both the long and short head of the biceps brachii

Answer 5

radial tuberosity

Question 6

Action(s) of the biceps brachii

Answer 6

• supination of forearm
• flexion at elbow
• stability of shoulder joint

Question 7

Origin of the coracobrachialis

Answer 7

coracoid process of scapula

Question 8

insertion of the coracobrachialis

Answer 8

middle of medial aspect of humerus

Question 9

Action of coracobrachialis

Answer 9

flexion at shoulder
adduction of humerus

Question 10

Origin of brachialis

Answer 10

humerus: anterior surface, lower half

Question 11

insertion of the brachialis

Answer 11

ulna: coronoid process and ulnar tuberosity

Question 12

action of brachialis

Answer 12

flexion at elbow

Question 13

Three heads of the triceps brachii

Answer 13

long head
medial head
lateral head

Question 14

innervation of triceps brachii

Answer 14

radial nerve

Question 15

origin of the long head of the triceps brachii

Answer 15

infraglenoid tubercle of scapula

Question 16

origin of the lateral head of the triceps brachii

Answer 16

posterior humerus, above radial groove

Question 17

origin of the medial head of the triceps brachii

Answer 17

posterior humerus, below radial groove

Question 18

common insertion for the triceps brachii

Answer 18

common tendon into olecranon process of ulna

Question 19

what is the medial head of triceps brachii deep to

Answer 19

it is deep to the lateral head

Question 20

the musculocutaneous nerve’s pathway

Answer 20

1. musculocutaneous nerve pierces coracobrachialis
2. reappears distally between biceps brachii and brachialis
3. ends as lateral cutaneous nerve of forearm