Muscle of the Upper Extremity

Question 1

Deltoid

Answer 1

Action: Flexes the arm, Medially rotates the arm, abducts the arm, Laterally rotates the arm, Extends the arm
Nerve: Axillary Nerve (C5-C6)

Question 2

Pectoralis Major

Answer 2

Action: Flexes the arm, Extends the arm, Medially rotate, Adduct
Nerve: Lateral Pectoral nerve (C5-C7), Medial pectoral nerve (C8-T1)

Question 3

Biceps Brachii

Answer 3

Actions: Flex the arm and Flexes and supinates the forearm
Nerve: Musculocutaneous nerve (C5-C7)

Question 4

Coracobrachialis

Answer 4

Actions: Flexes at the shoulder, adducts the arm
Nerve: Musculocutaneous nerve (C5-C7)

Question 5

Subscapularis

Answer 5

Actons: Medially rotates the arm
Nerve: Upper and lower sub scapular nerve (C5-C7)

Question 6

Trees Major

Answer 6

Actions: Adducts the arm, Medially rotates the arm, Extends the arm
Nerve: Lower sub scapular nerve (C5-C7)

Question 7

Latissimus Dorsi

Answer 7

Actions: Adducts the arm, Medially rotates the arm, Extends the arm
Nerve: Thoracodorsal nerve (C6-C8)

Question 8

Supraspinatus

Answer 8

Actions: Helps the deltoid muscle initiate the abduction, Helps stabilize the shoulder by drawing the humerus toward the glenoid fossa of the scapular
Nerve: Suprascapula (C5-C6)

Question 9

Infraspinatus

Answer 9

Action: Laterally rotates the arm, helps stabilize the shoulder by drawing the humerus toward the gleaned fossa of the scapula
Nerve: Suprascapular nerve (C5-C6)

Question 10

Teres Minor

Answer 10

Actions: Laterally rotates the arm, Weakly adducts the arm, Helps stablize the shoulder by drawing the humerus toward the gleaned fossa of the scapula
Nerve: Axillary nerve (C5-C6)

Question 11

Triceps Brachii

Answer 11

Actions: Extends the arm & forearm
Nerve: Radial Nerve (C7-C8)

Question 12

Serratus Ant

Answer 12

Action: Abducts scapula and upwardly rotates it while abducting the arm
Nerve: Long thoracic nerve (c5-C7)

Question 13

Pectoralis Minor

Answer 13

Actions: Draw scaupula forward and downward
Nerve: Medial pectoral (C8-T1)

Question 14

Levator Scapulae

Answer 14

Actions: Elevates medial border of scapula while downwardly rotating lateral angle, helps traps and rhomboid pulls scapula upward and medially; bends neck laterally
Nerve: Dorsal scapular (C5) and ventral primary rami of C3-C4

Question 15

Trapezius

Answer 15

Action: Elevate and upwardly rotate scapula, extend neck. Adduct (retract) scapula, depress and upwardly rotate scapula.
Nerve: C3-C4 & CN XI

Question 16

Rhomboid Major

Answer 16

Action: Retracts and elevates the medial border of scapula while it downwardly rotates the lateral angle
Nerve: Dorsal Scapular Nerve (C5)

Question 17

Rhomboid Minor

Answer 17

Actions: Retracts and elevates the medial border of scapula while it downwardly rotates the lateral angle
Nerve: Dorsal Scapular (C5)

Question 18

Brachialis

Answer 18

Action: Flexes forearm
Nerve: Musculocutaneous (C5-C6)

Question 19

Brachioradialis

Answer 19

Action: Flexes forearm
Nerve: Radial (C5-C6)

Question 20

Pronator Teres

Answer 20

Action: Pronates and flexes forearm
Nerve: Median Nerve (C6-C7)

Question 21

Flexor Carpi Raidalis

Answer 21

Action: Flexes and radial deviates (abducts)
Nerve: Median nerve (C6-C7)

Question 22

Palmaris Longus

Answer 22

Action: Flexes hand at wrist and tenses palmar aponeurosis
Nerve: Median (C7-C8)

Question 23

Flexor Carpi Ulnaris

Answer 23

Actions: Flexs and ulnar deviates (adducts) hand at the wrist
Nerve: Ulnar nerve (C8-T1)

Question 24

Flexor Carpi Digitorum Superficialis

Answer 24

Actions: Flexes middle phalanges. If action continues, flexes proximal phalanges, hands at wrist and forearm at elbow
Nerve: Median (C7-T1)

Question 25

Extensor Carpi Radialis Longus

Answer 25

Actions: Extends and radial deviates (abducts) Nerve: Radial nerve (C6-C7)

Question 26

Extensor Carpi Radialis Brevis

Answer 26

Actions: Extends and radial deviates (abducts) hand at wrist Nerve: Radial Nerve (C6-C7)

Question 27

Extensor Digitorum

Answer 27

Action: extends wrist and fingers (middle phalanx of digit 2-5) Nerve: Posterior Interosseous branch of radial nerve (C6 and C8)

Question 28

Extensor Carpi Ulnaris

Answer 28

Actions: Extends and ulnar deviates (adducts) hand at wrist Nerve: Radial nerve (C6-C8)

Question 29

Abductor pollicis longus

Answer 29

Action: Abduction at joints of thumb and wrist N: Posterior interosseous branch of Radial (C6-C7)

Question 30

Extensor pollicis brevis

Answer 30

Action: Extension at joints of thumb; abduction at wrist N: Posterior interosseous branch of Radial nerve (C6-C7)

Question 31

Extensor pollicis longus

Answer 31

A: Extension at joints of thumb; abduction at wrist N: Posterior interosseous branch of radial (C6-C8)

Question 32

Extensor indicis

Answer 32

A: Extension and adduction at jt of index finger N: Posterior interosseous branch of Radial (C6-C8)

Question 33

Extensor digiti minimi

Answer 33

A: Extension at jt of little finger; extension at wrist N: Posterior interosseous branch of Radial N. (C6-C8)

Question 34

Flexor digitorum profundus

Answer 34

A: Flexion at DIP, PIP, and Wrist N: Anterior interosseous branch of median nerve and ulnar nerve (C8-T1)

Question 35

Adductor pollicis

Answer 35

A: Adduction of thumb N: Ulnar nerve, deep branch (C8-T1)

Question 36

Opponens pollicis

Answer 36

A: Opposition of thumb N: Recurrent branch of the Median (C6-C7)

Question 37

Palmaris brevis

Answer 37

A: Moves skin on medial border toward midline of palm N: Ulnar nerve, superficial branch (C8)

Question 38

Abductor digiti minimi

Answer 38

A: Abduction of little finger and flexion at its MCP jt N: Ulnar n, deep branch (C8-T1)

Question 39

Abductor pollicis brevis

Answer 39

A: Abduction thumb N: recurrent branch of the median n. (C8-T1)

Question 40

Flexor pollicis brevis

Answer 40

A: Flexion and adduction of thumb N: Recurrent branch of median

Question 41

Flexor digiti minimi brevis

Answer 41

A: Flexion at 5th MCP jt N: Ulnar N, deep branch (C8-T1)

Question 42

Opponens digiti minimi

Answer 42

A: FLexion at MCP jt; brings digit into opposition with thumb N: Ulnar n, deep branch (C8-T1)

Question 43

Lumbrical

Answer 43

A: Flexion at MCP jt; ext at PIP and DIP jts N: No. 1 and No. 2 by median, No. 3 and No. 4 by ulnar nerve, deep branch (C8-T1)

Question 44

Dorsal Interosseus

Answer 44

A: Abduction at MCP jt of digits 2-4, flexion at MCP jt; ext at IP jts N: Ulnar nerve, deep branch (C8-T1)

Question 45

Palmar interosseus

Answer 45

A: Adduction at MCP jts of digits 2,4, and 5; Flexion at MCP jt; ext at IP its N: Ulnar n, deep branch (C8-T1)

Question 46

Pronator Quadratus

Answer 46

A: Pronates forearm and hand by medial rotation of radius at radioulnar jts N: Anterior Interosseous branch of the Median N (C5-T1)

Question 47

Supinator

Answer 47

A: Supinator forearm and hands by lateral rotation of radius at radioulnar jt N: Deep Radial N. (C6-C8)

Question 48

Subclavius

Answer 48

A: Depresses and protracts shoulder N: Nerve to subclavius (C5-C6)