Muscles Masterlist Flashcards
Subclavius
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)
Anterior Scalene
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
Middle Scalene
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
Posterior Scalene
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)
Biceps Brachii
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)
Coracobrachialis
A: flex and adduct shoulder, resists dislocation of shoulder
PA: coracoid process
DA: middle humerus
N: musculocutaneous nerve (C5, C6, C7)
Brachialis
A: flex elbow in all positions
PA: distal anterior humerus
DA: ulnar tuberosity, coronoid process of ulna
N: musculocutaneous nerve (C5, C6)
Brachioradialis
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)
Triceps Brachii
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)
Anconeus
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)
Pronator Teres
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)
Flexor Carpi Radialis
A: flex wrist, radial deviation
PA: medial epicondyle of humerus
DA: bases of 2nd and 3rd metacarpals
N: median nerve (C6, C7)
Flexor Carpi Ulnaris
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)
Flexor Digitorum Superficialis
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)
Flexor Digitorum Profundus
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)
Flexor Pollicis Longus
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)
Pronator Quadratus
A: pronate forearm, deep fibers bind radius and ulna together
PA: distal ulna
DA: distal radius
N: median nerve (AIN) (C8, T1)
Extensor Carpi Radialis Longus/Brevis
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)
Extensor Digitorum
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)
Extensor Digiti Minimi
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)
Extensor Carpi Ulnaris
A: extend wrist, ulnar deviation, active during fist clenching
PA: lateral epicondyle of humerus
DA: base of 5th metacarpal
N: radial nerve (C7, C8)
Supinator
A: supinate forearm
PA: lateral epicondyle of humerus, radial collateral ligament, anular ligament
DA: lateral radius
N: radial nerve (PIN) (C7, C8)
Extensor Indicis
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)
Abductor Pollicis Longus
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)
Extensor Pollicis Longus/Brevis
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)
Flexor Pollicis Brevis
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)
Abductor Pollicis Brevis
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)
Opponens Pollicis
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)
Flexor Digiti Minimi
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)
Abductor Digiti Minimi
A: abduct 5th digit (MCP)
PA: pisiform
DA: base of proximal phalanx of 5th digit
N: ulnar nerve (deep branch) (C8, T1)
Opponens Digiti Minimi
A: oppose 5th digit (CMC)
PA: flexor retinaculum, hook of hamate
DA: medial border of 5th metacarpal
N: ulnar nerve (deep branch) (C8, T1)
Adductor Pollicis
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)
Lumbricals
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)
Palmar Interossei
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)
Dorsal Interossei
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)
