Upper Extremities Myology

Question 1

Pectoralis Major M. action

Answer 1

1. Adduct and medially rotate the Humerus

2. Protracts and Depresses the Scapula

Question 2

Innervation and blood supply of Pectoralis major M.

Answer 2

Lateral and medical Pectoral N.

Thoracoacromial trunk

Question 3

Pectoralis Minor M. action

Answer 3

Stabilizes Scapula by protracting and depressing it against the thoracic wall.

Question 4

Innervation and blood supply of Pectoralis Minor M.

Answer 4

Medial Pectoral N.

Thoracoacromial trunk.

Question 5

Subclavius M. action

Answer 5

Positions and depresses the clavicula

Question 6

Innervation of Subclavius M.

Answer 6

Nerve to the Subclavius M.

Question 7

Serratus Anterior M. action(2)

Answer 7

1. Protracts the Scapula (stabilizing it against the thoracic wall).
2. Rotates the Glenoid Cavity superiorly.

Question 8

Innervation of Serratus Anterior M.

Answer 8

Long Thoracic N.

Question 9

Supraspinatus M. action(2)

Answer 9

1. Abducts the Humerus

2. Hold the Humeral Head in the Glenoid Cavity.

Question 10

Innervation of Supraspinatus M.

Answer 10

Suprascapular N.

Question 11

Infraspinatus M. action (2)

Answer 11

1. Laterally rotates the Humerus

2. Hold the Humeral head in the Glenoid Cavity.

Question 12

Innervation of Infraspinatus M.

Answer 12

Suprascapular N.

Question 13

Teres Minor M. action (2)

Answer 13

1. Laterally rotates the Humerus.

2. Holds the Humeral head in the Glenoid Cavity.

Question 14

Innervation of Teres Minor M.

Answer 14

Axillary N.

Question 15

Teres Major M. action(2)

Answer 15

Adducts and medially rotates the humerus.

Question 16

Innervation of Teres Major M.

Answer 16

Lower Subscapular N.

Question 17

Deltoid M. action: 3 parts:3 different actions

Answer 17

1. Anterior part: Flex and medially rotates the Humerus
2. Middle Part: Abduct the Humerus
3. Posterior Part: Extend and Laterally rotate the Humerus

Question 18

Innervation of Deltoid M.

Answer 18

Axillary N.

Question 19

Subscapularis M. action(2)

Answer 19

1. Medially rotate and adduct the Humerus

2. Holds the Humeral Head in the Glenoid Cavity.

Question 20

Innervation of Subscapularis M.

Answer 20

Upper and Lower Subscapular N.

Question 21

What are the 4 Rotator cuff muscles?

Answer 21

SITS

1. Supraspinatus
2. Infraspinatus
3. Teres Minor
4. Subscapularis

Question 22

What makes up the Triangular Space?

Answer 22

Teres Minor M.
Teres Major M.
Long head of the Triceps Brachii M.

Question 23

What makes up the Quadrangular Space?

Answer 23

Teres Minor M.
Teres Major M.
Long and Lateral Head of the Triceps Brachii M.

Question 24

Coracobrachialis M. action (2)

Answer 24

Flex and Adduct the Humerus

Question 25

Innervation of Coracobrachialis M.

Answer 25

Musculocutaneous N.

Question 26

Biceps Brachii M. action (3)

Answer 26

1. Flex the Humerus 2. Flex the supine Forearm and supinate the forearm. 3. Short Head resists dislocation of the shoulder.

Question 27

Innervation of Biceps Brachii M.

Answer 27

Musculocutaneous N.

Question 28

Brachialis M. action

Answer 28

Flex the forearm.

Question 29

Innervation of Brachialis M.

Answer 29

Musculocutaneous N.

Question 30

Triceps brachii M. Action (2)

Answer 30

1. Extend the forearm | 2. Long head resist dislocation of the shoulder.

Question 31

Innervation of Triceps brachia.

Answer 31

Radial N.

Question 32

Anconeus M. action (2)

Answer 32

with the Triceps Brachii M. extends the forearm, stabilizes the elbow joint.

Question 33

Innervation of the Anconeus M.

Answer 33

Radial N.

Question 34

Pronator Teres M. Action (2)

Answer 34

Pronate and flex the forearm.

Question 35

Innervation of Pronator Teres M.

Answer 35

Median N.

Question 36

Flexor Carpi Radialis M. action (2)

Answer 36

1. Flex the forearm | 2. Flex and Abduct Hand at wrist.

Question 37

Innervation of Capri Radialis M.

Answer 37

Median N.

Question 38

Flexor Carpi Ulnaris M. action (2)

Answer 38

1. Flex forearm. | 2. Flex and abduct hand at wrist.

Question 39

Innervation of Flexor Carpi Ulnaris M.

Answer 39

Ulnar N.

Question 40

Palmaris Longus M. action (2).

Answer 40

1. Flex forearm | 2. Flex hand and tenses the palmar aponeurosis.

Question 41

Innervation of Palmaris Longus M.

Answer 41

Median N.

Question 42

Flexor Digitorum Superficial M. action (3)

Answer 42

1. Flex forearm 2. Flex hand at the wrist. 3. Flex Proximal and Intermediate Phalanges of Digits 2-5 at the Metacarpolphalangeal and Proximal Interphalangeal joints.

Question 43

Innervation of Flexor Digitorum Superficial M.

Answer 43

Median N.

Question 44

Flexor Digitorum Profundus M. action (2)

Answer 44

1. Flex hand at wrist. | 2. Flex all the phalanges of digits 2-5

Question 45

Flexor Pollicis Longus M. action (2)

Answer 45

1. Flex hand | 2. Flex and abduct 1st metacarpal

Question 46

Innervation of Flexor Pollicis Longus M.

Answer 46

Anterior Interosseous N.

Question 47

Pronator Quadratus M. action (2)

Answer 47

1. Pronate forearm. | 2. Deep fibers hold the Ulna and Radius together.

Question 48

Innervation of Pronator Quadratus M.

Answer 48

Anterior Interosseous N.

Question 49

Brachiocardialis M. action

Answer 49

Flex forearm

Question 50

Innervation of Brachiocardialis M.

Answer 50

Radial N.

Question 51

Extensor Carpi Radialis Longus M. action (2)

Answer 51

Extends and abducts hand at wrist.

Question 52

Innervation of Carpi Radialis Longus M.

Answer 52

Radial N.

Question 53

Extensor Carpi Radialis Brevis M. action (2)

Answer 53

Extend and abducts hand at wrist.

Question 54

Innervation of Carpi Radialis Brevis M.

Answer 54

Deep Radial N.

Question 55

Extensor Digitorum M. action (2)

Answer 55

1. Extends hand at wrist. | 2. extends all phalanges of digits 2-5

Question 56

Innervation of Extensor Digitorum M.

Answer 56

Posterior Interosseous N.

Question 57

Extensor Digiti Minimi M. action

Answer 57

Extends all phalanges of digit 5.

Question 58

Innervation of Extensor Digiti Minimi M.

Answer 58

Posterior Interosseous N.

Question 59

Extensor Carpi Ulnaris M. action (2)

Answer 59

Extends and abducts hand at wrist.

Question 60

Innervation of Carpi Ulnaris M.

Answer 60

Posterior Interosseous N.

Question 61

Supinator M. action

Answer 61

Supinate forearm

Question 62

Innervation of Supinator M.

Answer 62

Deep Radial N.

Question 63

Extensor Indicis M. action (2)

Answer 63

1. Extends hand at the wrist. | 2. extends 2nd digit.

Question 64

Innervation of Extensor Indicis M.

Answer 64

Posterior Interosseous N.

Question 65

Abductor Pollicis Longus M. action

Answer 65

Abducts hand at wrist and abducts the pollux at the Carpometacarpal Joint.

Question 66

Innervation of Abductor Pollicis Longus M.

Answer 66

Posterior Interosseous N.

Question 67

Extensor Pollicis Brevis M. action (2)

Answer 67

1. Abducts hand | 2. Extends 1st metacarpal and proximal phalanges of the Pollux at the Carpometacarpal and Metacarpophalangeal joints.

Question 68

Innervation of Extensor Pollicis Brevis M.

Answer 68

Posterior Interosseous N.

Question 69

Extensor Pollicis Longus M. action (2)

Answer 69

1. Abducts hand at the wrist. | 2. Extends 1st Metacarpal, Proximal and Distal Phalanges of the Pollux(thumb).

Question 70

Innervation of Extensor Pollicis Longus M.

Answer 70

Posterior Interosseous N.

Question 71

Abductor Pollicis Brevis M. action (2) | What kind of muscle?

Answer 71

Abducts Pollux, aids in Opposition. | It is a Thenar Muscle.

Question 72

Innervation of Abductor Pollicis Brevis M.

Answer 72

Recurrent branch of Median N.

Question 73

Flexor Pollicis Brevis M. action

Answer 73

Flex 1st metacarpal and proximal phalanges of the Pollux.

Question 74

Innervation of Flexor Pollicis Brevis M. (2)

Answer 74

Superficial Head: Recurrent Branch of the Median N. | Deep Head: Deep Ulnar N.

Question 75

Opponens Pollicis M. action

Answer 75

Oppose Pollux

Question 76

Innervation of Pollicis M.

Answer 76

Recurrent Branch of the median N.

Question 77

Adductor Pollicis M. action

Answer 77

Adduct Pollux

Question 78

Innervation of Adducotr Pollicis M.

Answer 78

Deep Ulnar N.

Question 79

Abductor Digiti Minimi M. action

Answer 79

Abducts 5th digit.

Question 80

Innervation of Abductor Digiti Minimi M.

Answer 80

Deep ulnar N.

Question 81

Flexor Digiti Minimi Brevis M. action

Answer 81

Flex proximal phalanx of 5th digit.

Question 82

Innervation of Flexor Digiti Minimi Brevis M.

Answer 82

Deep Ulnar N.

Question 83

Opponens Digiti Minimi M. action

Answer 83

Oppose 5th digit.

Question 84

Innervation of Opponens Digiti Minimi M.

Answer 84

Deep Ulnar N.

Question 85

1st and 2nd Lumbrical M. action (2)

Answer 85

1. Flex Proximal Phalanges of the 2nd and 3rd Digits at the Metacarpophalangeal Joint. 2. Extend Intermediate and Distal Phalanges of the 2nd and 3rd digits by tightening extensor expansion.

Question 86

Innervation of 1st and 2nd Lumbrical M.

Answer 86

Median N.

Question 87

3rd and 4th Lumbrical M. action (2)

Answer 87

1. Flex proximal phalanges of the 4th and 5th Digits at the Metacarpophalangeal Joint 2. Extend Intermediate and Distal Phalanges of the 4th and 5th Digits by tightening extensor expansion.

Question 88

Dorsal Interossei M. action (3)

Answer 88

1. Abduct digits 2-4 (DAB) 2. Flex proximal phalanges at the metacarpophalangeal joint 3. Extend Intermediate and Distal Phalanges by tightening extensor expansion.

Question 89

Palmar Interosseous M. action (2)

Answer 89

1. Adduct 2nd, 4th, and 5th Digits at the metacarpophalangeal Joint (PAD) 2. Extend Intermediate and Distal Phalanges of the 2nd, 4th, and 5th Digits by tightening extensor expansion.

Question 90

Innervation of Palmar Interosseous M.

Answer 90

Deep Ulnar N.

Question 91

Innervation of Dorsal Interossei M.

Answer 91

Deep Ulnar N.