Muscles Masterlist

Question 1

Subclavius

Answer 1

A: depress and anchor clavicle
PA: junction of 1st rib and its costal cartilage
DA: inferior surface of middle clavicle
N: nerve to subclavius (C5, C6)

Question 2

Anterior Scalene

Answer 2

A: elevate 1st rib during forced inhalation, lateral flexion of neck
PA: TP C3-C6
DA: 1st rib
N: cervical spinal nerve C4, C5, C6

Question 3

Middle Scalene

Answer 3

A: elevate 1st rib during forced inhalation, lateral flexion of neck
PA: TP C5-C7
DA: 1st rib
N: ventral rami of cervical spinal nerves

Question 4

Posterior Scalene

Answer 4

A: elevate 2nd rib during forced inhalation, lateral flexion of neck
PA: TP C5-C7
DA: 2nd rib
N: ventral rami of cervical spinal nerves (C7, C8)

Question 5

Biceps Brachii

Answer 5

A: supinate and flex forearm, (short head) resists dislocation of shoulder
PA: (short head) coracoid process, (long head) supraglenoid tubercle and labrum
DA: radial tuberosity, fascia of forearm via bicipital aponeurosis
N: musculocutaneous nerve (C5, C6, C7)

Question 6

Coracobrachialis

Answer 6

A: flex and adduct shoulder, resists dislocation of shoulder
PA: coracoid process
DA: middle humerus
N: musculocutaneous nerve (C5, C6, C7)

Question 7

Brachialis

Answer 7

A: flex elbow in all positions
PA: distal anterior humerus
DA: ulnar tuberosity, coronoid process of ulna
N: musculocutaneous nerve (C5, C6)

Question 8

Brachioradialis

Answer 8

A: flex elbow in midpronated position, assist w/ supination/pronation when restricted/from end range
PA: lateral supra-epicondylar ridge of humerus
DA: distal lateral radius (proximal to styloid process)
N: radial nerve (C5, C6, C7)

Question 9

Triceps Brachii

Answer 9

A: extend elbow, (long head) resists dislocation of shoulder
PA: (long head) infraglenoid tubercle, (lateral head) posterior humerus superior to radial groove, (medial head) posterior humerus inferior to radial groove
DA: olecranon of ulna
N: radial nerve (C6, C7, C8)

Question 10

Anconeus

Answer 10

A: assist triceps in elbow extension, stabilize elbow joint, may abduct ulna during pronation
PA: lateral epicondyle of humerus
DA: lateral olecranon
N: radial nerve (C7, C8, T1)

Question 11

Pronator Teres

Answer 11

A: pronate forearm, assists to flex elbow
PA: medial epicondyle of humerus (common flexor tendon), coronoid process
DA: middle radius (lateral surface)
N: median nerve (C6, C7)

Question 12

Flexor Carpi Radialis

Answer 12

A: flex wrist, radial deviation
PA: medial epicondyle of humerus
DA: bases of 2nd and 3rd metacarpals
N: median nerve (C6, C7)

Question 13

Flexor Carpi Ulnaris

Answer 13

A: flex wrist, ulnar deviation
PA: (humeral head) medial epicondyle of humerus, (ulnar head) posterior ulna
DA: base of 5th metacarpal, pisiform, hook of hamate
N: ulnar nerve (C7, C8)

Question 14

Flexor Digitorum Superficialis

Answer 14

A: flex proximal (MCP) and middle (PIP) phalanges of digits 2-5
PA: (humero-ulnar head) medial epicondyle of humerus and coronoid process, (radial head) anterior radius
DA: shafts of middle phalanges of medial 4 digits
N: median nerve (C7, C8, T1)

Question 15

Flexor Digitorum Profundus

Answer 15

A: flex medial 4 digits (MCP, PIP, DIP), assists to flex wrist
PA: proximal ulna, interosseous membrane
DA: (medial) base of distal phalanges of digits 4-5, (lateral) base of distal phalanges of digits 2-3
N: (digits 2-3) median nerve (AIN) (C8, T1), (digits 4-5) ulnar nerve (C8, T1)

Question 16

Flexor Pollicis Longus

Answer 16

A: flex phalanges of 1st digit (thumb)
PA: anterior radius, adjacent interosseous membrane
DA: base of distal phalanx of thumb
N: median nerve (AIN) (C8, T1)

Question 17

Pronator Quadratus

Answer 17

A: pronate forearm, deep fibers bind radius and ulna together
PA: distal ulna
DA: distal radius
N: median nerve (AIN) (C8, T1)

Question 18

Extensor Carpi Radialis Longus/Brevis

Answer 18

A: extend wrist, radial deviation, (longus) active during fist clenching
PA: (longus) lateral supra-epicondylar ridge of humerus, (brevis) lateral epicondyle of humerus (common extensor tendon)
DA: (longus) base of 2nd metacarpal, (brevis) base of 3rd metacarpal
N: radial nerve (C6, C7, C8)

Question 19

Extensor Digitorum

Answer 19

A: extend medial 4 digits (MCP, PIP, DIP)
PA: lateral epicondyle of humerus
DA: extensor expansions of medial 4 digits
N: radial nerve (deep branch) (C7, C8)

Question 20

Extensor Digiti Minimi

Answer 20

A: extend 5th digit (MCP, PIP, DIP)
PA: lateral epicondyle of humerus
DA: extensor expansion of 5th digit
N: radial nerve (deep branch) (C7, C8)

Question 21

Extensor Carpi Ulnaris

Answer 21

A: extend wrist, ulnar deviation, active during fist clenching
PA: lateral epicondyle of humerus
DA: base of 5th metacarpal
N: radial nerve (C7, C8)

Question 22

Supinator

Answer 22

A: supinate forearm
PA: lateral epicondyle of humerus, radial collateral ligament, anular ligament
DA: lateral radius
N: radial nerve (PIN) (C7, C8)

Question 23

Extensor Indicis

Answer 23

A: extend 2nd digit (MCP), may assist to extend wrist
PA: posterior ulna, interosseous membrane
DA: extensor expansion of 2nd digit
N: radial nerve (PIN) (C7, C8)

Question 24

Abductor Pollicis Longus

Answer 24

A: abduct and extend thumb (CMC)
PA: posterior surface of ulna, radius, interosseous membrane
DA: base of 1st metacarpal
N: radial nerve (PIN) (C7, C8)

Question 25

Extensor Pollicis Longus/Brevis

Answer 25

A: extend thumb (MCP, CMC), (longus) extend thumb (IP) PA: (longus) posterior ulna and interosseous membrane, (brevis) posterior radius and interosseous membrane DA: (longus) base of distal phalanx of thumb, (brevis) base of proximal phalanx of thumb N: radial nerve (PIN) (C7, C8)

Question 26

Flexor Pollicis Brevis

Answer 26

A: flex thumb (MCP, CMC), assist in opposition of thumb PA: flexor retinaculum, tubercles of scaphoid and trapezium DA: base of proximal phalanx of thumb N: (superficial head) median nerve (recurrent branch) (C8, T1), (deep head) ulnar nerve (deep branch) (C8, T1)

Question 27

Abductor Pollicis Brevis

Answer 27

A: abduct thumb (MCP, CMC), assist in opposition of thumb PA: flexor retinaculum, tubercles of scaphoid and trapezium DA: base of proximal phalanx of thumb N: median nerve (recurrent branch) (C8, T1)

Question 28

Opponens Pollicis

Answer 28

A: thumb opposition ... draw 1st metacarpal medially to center of palm and rotate it medially PA: flexor retinaculum, tubercles of scaphoid and trapezium DA: 1st metacarpal N: median nerve (recurrent branch) (C8, T1)

Question 29

Flexor Digiti Minimi

Answer 29

A: flex proximal phalanx of 5th digit (MCP) PA: flexor retinaculum, hook of hamate DA: base of proximal phalanx of 5th digit N: ulnar nerve (deep branch) (C8, T1)

Question 30

Abductor Digiti Minimi

Answer 30

A: abduct 5th digit (MCP) PA: pisiform DA: base of proximal phalanx of 5th digit N: ulnar nerve (deep branch) (C8, T1)

Question 31

Opponens Digiti Minimi

Answer 31

A: oppose 5th digit (CMC) PA: flexor retinaculum, hook of hamate DA: medial border of 5th metacarpal N: ulnar nerve (deep branch) (C8, T1)

Question 32

Adductor Pollicis

Answer 32

A: adduct thumb toward lateral border of palm PA: (oblique head) base of 2nd and 3rd metacarpals, capitate, adjacent carpals, (transverse head) shaft of 3rd metacarpal DA: base of proximal phalanx of thumb N: ulnar nerve (deep branch) (C8, T1)

Question 33

Lumbricals

Answer 33

A: flex MCP and extend IPs of digits 2-5 PA: (1st and 2nd) lateral 2 tendons of FDP as unipennate, (3rd and 4th) medial 3 tendons of FDP as bipennate DA: radial sides of extensor expansions of digits 2-5 N: (1st and 2nd) median nerve (digital branch) (C8, T1), (3rd and 4th) ulnar nerve (deep branch) (C8, T1)

Question 34

Palmar Interossei

Answer 34

A: adduct digits 2, 4, and 5 toward axial line, assist lumbricals w/ MCP flexion and IP extension PA: palmar surfaces of 2nd, 4th, and 5th metcarpals (unipennate) DA: bases of proximal phalanges, extensor expansions of digits 2, 4, and 5 N: ulnar nerve (deep branch) (C8, T1)

Question 35

Dorsal Interossei

Answer 35

A: abduct digits 2-4 from axial line, assist lumbricals w/ MCP flexion and IP extension PA: adjacent sides of two metacarpals (bipennate) DA: bases of proximal phalanges, extensor expansions of digits 2-4 N: ulnar nerve (deep branch) (C8, T1)