Origins, Insertions, Actions Of Muscle

Question 1

Actions of Pectoralis major:

Answer 1

• Prime mover of arm flexion
• Rotates arm medially
• Adducts arm

Question 2

Insertions of Pectoralis minor:

Answer 2

Coracoid process of scapula

Question 3

Actions of Pectoralis minor:

Answer 3

With ribs fixed, protracts and rotates scapula downward

Question 4

Insertions of Serratus anterior:

Answer 4

Entire anterior surface of vertebral border of scapula

Question 5

Actions of Serratus anterior:

Answer 5

Rotates scapula upward

Question 6

Origin of Subscapularis:

Answer 6

Subscapular fossa of scapula

Question 7

Insertions of Subscapularis:

Answer 7

Lesser tubercle of humerus

Question 8

Actions of Subscapularis:

Answer 8

Medically rotates arm

Question 9

Insertions of Pectoralis major:

Answer 9

• Fibers converge to insert by a short tendon into greater tubercle of humerus
• Deltoid tuberosity of humerus

Question 10

Origin of Coracobrachialis:

Answer 10

Coracoid process of scapula

Question 11

Insertions of Coracobrachialis:

Answer 11

Medial surface of humerus shaft

Question 12

Actions of Coracobrachialis:

Answer 12

Flexion and adduction of arm

Question 13

Origin of Biceps brachii long head:

Answer 13

Supraglenoid tubercle and lip of glenoid cavity

Question 14

Insertions of Biceps brachii long head:

Answer 14

By common tendon into radial tuberosity

Question 15

Actions of Biceps brachii long head:

Answer 15

Flexes and supinates forearm

Question 16

Origin of Biceps brachii short head:

Answer 16

Coracoid process

Question 17

Insertions of Biceps brachii short head:

Answer 17

By common tendon into radial tuberosity

Question 18

Actions of Biceps brachii short head:

Answer 18

Flexes and supinates forearm

Question 19

Origin of Brachialis:

Answer 19

Anterior surface of distal humerus

Embraces insertion of deltoid muscle

Question 20

Insertions of Brachialis:

Answer 20

Coronoid process of ulna and scapula of elbow joint

Question 21

Actions of Brachialis:

Answer 21

Flexes forearm

Question 22

Origin of Pronator teres:

Answer 22

Medial epicondyle of humerus

Coronoid process of ulna

Question 23

Insertions of Pronator teres:

Answer 23

By common tendon into lateral radius, midshaft

Question 24

Actions of Pronator teres:

Answer 24

Pronates forearm

Question 25

Origin of Flexor carpi radialis:

Answer 25

Medial epicondyle of humerus

Question 26

Actions of Flexor carpi radialis:

Answer 26

Powerful flexor of hand

Question 27

Origin of Palmaris longus:

Answer 27

Medial epicondyle of humerus

Question 28

Insertions of Palmaris longus:

Answer 28

Fascia of palm (palmar aponeurosis)

Question 29

Actions of Palmaris longus:

Answer 29

Tenses skin and fascia of palm during hand movements

Question 30

Origin of Flexor carpi ulnaris:

Answer 30

Medial epicondyle of humerus Olecranon and posterior surface of ulna

Question 31

Actions of Flexor carpi ulnaris:

Answer 31

Flexes and adducts hand

Question 32

Origin of Flexor digitorum superficialis:

Answer 32

Medial epicondyle of humerus Coronoid process of ulna Shaft of radius

Question 33

Insertions of Flexor digitorum superficialis:

Answer 33

By four tendons into middle phalanges of fingers 2-5

Question 34

Actions of Flexor digitorum superficialis:

Answer 34

Flexes hand and middle phalanges of fingers 2-5

Question 35

Insertions of Flexor digitorum profundus:

Answer 35

By four tendons into distal phalanges of fingers 2-5

Question 36

Actions of Flexor digitorum profundus:

Answer 36

Flexes distal interphalangeal joints

Question 37

Insertions of Flexor pollicis longus:

Answer 37

Distal phalanx of thumb

Question 38

Actions of Flexor pollicis longus:

Answer 38

Flexes distal phalanx of thumb

Question 39

Insertions of Pronator quadratus:

Answer 39

Distal surface of anterior radius

Question 40

Actions of Pronator quadratus:

Answer 40

Prime mover of forearm pronation

Question 41

Origin of Brachioradialis:

Answer 41

Lateral supracondylar ridge at distal end of humerus

Question 42

Insertions of Brachioradialis:

Answer 42

Base of styloid process of radius

Question 43

Actions of Brachioradialis:

Answer 43

Synergist in forearm flexion

Question 44

Origin of Extensor carpi radialis longus:

Answer 44

Lateral supercondylar ridge of humerus

Question 45

Actions of Extensor carpi radialis longus:

Answer 45

Extends hand and abducts hand

Question 46

Origin of Extensor carpi radialis brevis:

Answer 46

Lateral epicondyle of humerus

Question 47

Actions of Extensor carpi radialis brevis:

Answer 47

Extends and abducts hand

Question 48

Origin of Extensor digitorum:

Answer 48

Lateral epicondyle of humerus

Question 49

Actions of Extensor digitorum:

Answer 49

Prime mover of finger extension

Question 50

Origin of Extensor digiti minimi:

Answer 50

Lateral epicondyle of humerus

Question 51

Actions of Extensor digiti minimi:

Answer 51

Prime mover of finger extension

Question 52

Origin of Extensor carpi ulnaris:

Answer 52

Lateral epicondyle of humerus and posterior border of ulna

Question 53

Actions of Extensor carpi ulnaris:

Answer 53

Extends hand and adducts hand

Question 54

Insertions of Abductor pollicis longus:

Answer 54

Base of first metacarpal and trapezium

Question 55

Actions of Abductor pollicis longus:

Answer 55

Abducts and extends thumb

Question 56

Insertions of Extensor policis brevis:

Answer 56

Base of proximal phalanx of thumb

Question 57

Actions of Extensor pollicis brevis:

Answer 57

Extends thumb

Question 58

Insertions of Extensor pollicis longus:

Answer 58

Base of distal phalanx of thumb

Question 59

Actions of Extensor pollicis longus:

Answer 59

Extends thumb

Question 60

Actions of Extensor indicis:

Answer 60

Extends index finger