upper_arm_muscles_flashcards_updated

Question 1

Q

Answer 1

A

Question 2

Where does the long head of the biceps brachii originate?

Answer 2

Supraglenoid tubercle of the scapula.

Question 3

Where does the short head of the biceps brachii originate?

Answer 3

Coracoid process of the scapula.

Question 4

Where does the biceps brachii insert?

Answer 4

Radial tuberosity and bicipital aponeurosis.

Question 5

What nerve innervates the biceps brachii?

Answer 5

Musculocutaneous nerve.

Question 6

What is the action of the biceps brachii?

Answer 6

Flexes forearm (especially when supinated), assists in shoulder flexion, supinates the forearm.

Question 7

What is the function of the long head of the biceps brachii at the shoulder joint?

Answer 7

Assists in abduction.

Question 8

What is the function of the short head of the biceps brachii at the shoulder joint?

Answer 8

Assists in adduction and internal rotation.

Question 9

Where does the brachialis originate?

Answer 9

Distal half of the anterior surface of the humerus.

Question 10

Where does the brachialis insert?

Answer 10

Coronoid process and tuberosity of the ulna.

Question 11

What nerve innervates the brachialis?

Answer 11

Musculocutaneous and radial nerves.

Question 12

What is the action of the brachialis?

Answer 12

Strong flexion of the forearm at the elbow joint, particularly when pronated.

Question 13

Where does the coracobrachialis originate?

Answer 13

Coracoid process of the scapula.

Question 14

Where does the coracobrachialis insert?

Answer 14

Anteromedial surface of the humeral shaft.

Question 15

What nerve innervates the coracobrachialis?

Answer 15

Musculocutaneous nerve.

Question 16

What is the action of the coracobrachialis?

Answer 16

Assists in flexion and adduction of the arm at the shoulder joint.

Question 17

Where does the long head of the triceps brachii originate?

Answer 17

Infraglenoid tubercle of the scapula.

Question 18

Where does the lateral head of the triceps brachii originate?

Answer 18

Posterior surface of the humerus superior to the radial groove.

Question 19

Where does the medial head of the triceps brachii originate?

Answer 19

Posterior surface of the humerus inferior to the radial groove.

Question 20

Where does the triceps brachii insert?

Answer 20

Olecranon of the ulna.

Question 21

What nerve innervates the triceps brachii?

Answer 21

Radial nerve.

Question 22

What is the action of the triceps brachii?

Answer 22

Extends the forearm at the elbow joint; the long head also extends and adducts the arm at the shoulder joint.

Question 23

Where does the anconeus originate?

Answer 23

Lateral epicondyle of the humerus.

Question 24

Where does the anconeus insert?

Answer 24

Olecranon of the ulna.

Question 25

What nerve innervates the anconeus?

Answer 25

Radial nerve.

Question 26

What is the action of the anconeus?

Answer 26

Assists in extending the forearm at the elbow joint.

Question 27

What is the primary function of the biceps brachii?

Answer 27

Powerful flexor of the forearm at the elbow joint.

Question 28

What is the secondary function of the biceps brachii?

Answer 28

Supination of the forearm.

Question 29

Which head of the biceps brachii assists in abduction of the arm?

Answer 29

Long head.

Question 30

Which head of the biceps brachii assists in adduction of the arm?

Answer 30

Short head.

Question 31

What is unique about the brachialis compared to the biceps brachii?

Answer 31

It is the primary flexor of the forearm regardless of forearm position.

Question 32

What additional movement does the coracobrachialis assist with?

Answer 32

Internal rotation of the arm at the shoulder joint.

Question 33

Which head of the triceps brachii crosses the shoulder joint?

Answer 33

Long head.

Question 34

What is the role of the lateral and medial heads of the triceps brachii?

Answer 34

Extension of the forearm at the elbow joint.

Question 35

What secondary role does the anconeus play?

Answer 35

Stabilizes the elbow joint during extension.

Question 36

How is the anconeus related to the triceps brachii?

Answer 36

It is often partially or completely blended with the triceps brachii.