MUSCLES OF THE ARM

Question 1

What are the 4 arm muscles?

Answer 1

1. biceps brachii
2. brachialis
3. coracobrachialis
4. triceps brachii

Question 2

What are the 3 flexor muscles of the arm?

Answer 2

1. biceps brachii
2. brachialis
3. coracobrachialis

Question 3

What is the extensor muscle of the arm?

Answer 3

triceps brachii

Question 4

what innervates the arm flexors?

Answer 4

musculocutaneous nerve

Question 5

what innervates the arm extensor?

Answer 5

radial nerve

Question 6

what are the proximal and distal attachments of biceps brachii?

Answer 6

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

distal: tuberosity of radius

Question 7

what is the innervation of biceps brachii?

Answer 7

musculocutaneous nerve

Question 8

what is the action of biceps brachii?

Answer 8

supinates forearm

flexes elbow when forearm is supinated

short head resists shoulder dislocation

Question 9

what are the proximal and distal attachments of brachialis?

Answer 9

proximal: distal humerus
distal: coronoid process and tuberosity of ulna

Question 10

what is the innervation of brachialis?

Answer 10

musculocutaneous nerve

Question 11

what is the action of brachialis?

Answer 11

flexes elbow

Question 12

what are the proximal and distal attachments of coracobrachialis?

Answer 12

proximal: coracoid process of scapula
distal: middle of humerus

Question 13

what is the innervation of coracobrachialis?

Answer 13

musculocutaneous nerve

Question 14

what is the action of coracobrachialis?

Answer 14

flex and adduct shoulder

resist dislocation of shoulder

Question 15

what are the proximal and distal attachments of triceps brachii?

Answer 15

proximal attachment:
long head: infraglenoid tubercle
lateral head: humerus
medial head: humerus

distal: olecranon

Question 16

what is the innervation of triceps brachii?

Answer 16

radial nerve

Question 17

what is the action of triceps brachii?

Answer 17

extend elbow

Question 18

what are the proximal and distal attachments of the anconeus?

Answer 18

proximal: lateral epicondyle of humerus
distal: olecranon

Question 19

what innervates the anconeus?

Answer 19

radial nerve

Question 20

what is the action of the anconeus?

Answer 20

assists triceps in extending elbow

abduct ulna during pronation

Question 21

where is the cubital fossa?

Answer 21

anterior surface of the elbow

Question 22

what are the boundaries of the cubital fossa?

Answer 22

superiorly: imaginary line btw medial and lateral epicondyles
medially: pronator teres
laterally: brachioradialis
floor: brachialis and supinator muscles
roof: brachial and antebrachial fascia

Question 23

what are the contents of the cubital fossa?

Answer 23

1. brachial artery
2. biceps brachii tendon
3. median nerve
4. radial nerve