muscle action flashcards

Question 1

What is the action of the Pectoralis major muscle?

Answer 1

Both heads: Adducts and medially rotates the GH joint. Clavicular head: flexes the GH joint

Question 2

What is the action of the Pectoralis minor muscle?

Answer 2

Protracts the scapula. Stabilises scapula on the thoracic wall.

Question 3

What is the action of the Subclavius muscle?

Answer 3

Anchors and depresses the clavicle

Question 4

What is the action of the Serratus anterior muscle?

Answer 4

Protracts and superiorly rotates the scapula. Stabilises scapula on thoracic wall

Question 5

What is the action of the Trapezius muscle?

Answer 5

Elevates, depresses, retracts, and rotates scapula

Question 6

What is the action of the Levator scapulae muscle?

Answer 6

Elevates and inferiorly rotates the scapula

Question 7

What is the action of the Latissimus dorsi muscle?

Answer 7

Extends, adducts and medially rotates the glenohumeral joint

Question 8

What is the action of the Rhomboid major muscle?

Answer 8

Retracts and inferiorly rotates the scapula. Stabilises the scapula on the thoracic wall.

Question 9

What is the action of the Rhomboid minor muscle?

Answer 9

Retracts and inferiorly rotates the scapula. Stabilises the scapula on the thoracic wall.

Question 10

What is the action of the Deltoid muscle?

Answer 10

Anterior part flexes and medially rotates the GH joint; middle part abducts the GH joint; posterior part extends and laterally rotates the GH joint.

Question 11

What is the action of the Teres major muscle?

Answer 11

Adducts and medially rotates the glenohumeral joint

Question 12

What is the action of the Subscapularis muscle?

Answer 12

Medially rotates the glenohumeral joint. Stabilises the glenohumeral joint

Question 13

What is the action of the Supraspinatus muscle?

Answer 13

Initiates and assists deltoid in abduction of the glenohumeral joint. Stabilizes the glenohumeral joint

Question 14

What is the action of the Teres minor muscle?

Answer 14

Laterally rotates the glenohumeral joint. Stabilises the glenohumeral joint

Question 15

What is the action of the Infraspinatus muscle?

Answer 15

Laterally rotates the glenohumeral joint. Stabilises the glenohumeral joint

Question 16

What is the action of the Biceps brachii muscle?

Answer 16

Both heads: Supinate the forearm and flex the elbow joint. Short head resists dislocation of the glenohumeral joint

Question 17

What is the action of the Coracobrachialis muscle?

Answer 17

Flexes and adducts the glenohumeral joint. Also resists dislocation of the glenohumeral joint

Question 18

What is the action of the Brachialis muscle?

Answer 18

Flexes the elbow joint in all positions

Question 19

What is the action of the Triceps brachii muscle?

Answer 19

All heads: Extend the elbow joint. Long head prevents dislocation of the glenohumeral joint

Question 20

What is the action of the Anconeus muscle?

Answer 20

Weakly extends the elbow joint

Question 21

What is the action of the Pronator teres muscle?

Answer 21

Pronates the forearm and flexes the elbow joint

Question 22

What is the action of the Flexor carpi radialis muscle?

Answer 22

Flexes and radially deviates the wrist joint

Question 23

What is the action of the Palmaris longus muscle?

Answer 23

Flexes the wrist joint and tenses the palmar aponeurosis

Question 24

What is the action of the Flexor carpi ulnaris muscle?

Answer 24

Flexes and ulnar deviates the wrist joint

Question 25

What is the action of the Flexor digitorum superficialis muscle?

Answer 25

Flexes digits 2-5 at the proximal interphalangeal joints (PIPs) and metacarpophalangeal joints (MCPs)

Question 26

What is the action of the Flexor digitorum profundus muscle?

Answer 26

Flexes digits 2-5 at the distal interphalangeal joints (DIPs)

Question 27

What is the action of the Flexor pollicis longus muscle?

Answer 27

Flexes thumb at interphalangeal joint and metacarpophalangeal (MCP) joint

Question 28

What is the action of the Pronator quadratus muscle?

Answer 28

Pronates the forearm

Question 29

What is the action of the Brachioradialis muscle?

Answer 29

Flexes the elbow joint when it is in the mid-prone position

Question 30

What is the action of the Extensor carpi radialis longus muscle?

Answer 30

Extends and radially deviates the wrist joint

Question 31

What is the action of the Extensor carpi radialis brevis muscle?

Answer 31

Extends and radially deviates the wrist joint

Question 32

What is the action of the Extensor digitorum muscle?

Answer 32

Extends digits 2-5 at the metacarpophalangeal (MCP) joint & interphalangeal joints

Question 33

What is the action of the Extensor digiti minimi muscle?

Answer 33

Extends 5th digit at the metacarpophalangeal (MCP) & interphalangeal joints

Question 34

What is the action of the Extensor carpi ulnaris muscle?

Answer 34

Extends and ulnar deviates the wrist joint

Question 35

What is the action of the Supinator muscle?

Answer 35

Supinates the forearm

Question 36

What is the action of the Abductor pollicis longus muscle?

Answer 36

Abducts the thumb and extends it at the carpometacarpal joint

Question 37

What is the action of the Extensor pollicis brevis muscle?

Answer 37

Extends thumb at metacarpophalangeal joint (MCP) and carpometacarpal joint

Question 38

What is the action of the Extensor pollicis longus muscle?

Answer 38

Extends the thumb at the interphalangeal joint, metacarpophalangeal (MCP) joint & carpometacarpal joint

Question 39

What is the action of the Extensor indicis muscle?

Answer 39

Extends 2nd digit at the metacarpophalangeal (MCP) joint & interphalangeal joints