Elbow, Wrist, and Hand Muscles Flashcards
(22 cards)
Brachialis
O: Distal half of the humerus, anterior surface
I: Coronoid process, ulnar tuberosity
A: Elbow flexion
N: Musculocutaneous n. (C5, C6)
Biceps Brachii
O: Long head–Supraglenoid tubercle of the scapula
Short head–Coracoid process of scapula
I: Radial tuberosity
A: Elbow flexion, forearm supination
N: Musculocutaneous n. (C5, C6)
Brachioradialis
O: Lateral supracondylar ridge on the humerus
I: Styloid process of radius
A: Elbow flexion
N: Radial n. (C5, C6)
Triceps
O:
Long head–Infraglenoid tubercle of scapula
Lateral head–Inferior to the greater tubercle on posterior humerus
Medial head–Posterior surface of humerus
I: Olecranon process of ulna
A: Elbow extension
N: Radial n. (C6, C7, C8)
Anconeus
O: Lateral epicondyle of humerus
I: Lateral and inferior to olecranon process of ulna
A: Not a prime mover, but assists with elbow extension
N: Radial n. (C6, C7, C8)
Pronator teres
O: Medial epicondyle of humerus and coronoid process of ulna
I: Lateral aspect of radius at midpoint
A: Forearm pronation, assists in elbow flexion
N: Median n. (C6, C7)
Pronator Quadratus
O: Distal 1/4 of ulna
I: Distal 1/4 of radius
A: Forearm pronation
N: Median n. (C8, T1)
Supinator
O: Lateral epicondyle of humerus and adjacent ulna
I: Anterior surface of proximal radius
A: Forearm supination
N: Radial n. (C6)
Flexor carpi radialis
O: Medial epicondyle of humerus
I: Base of 2nd and 3rd metacarpals on palmar surface
A: Wrist flexion, radial deviation
N: Median n. (C6, C7)
Palmaris longus
O: Medial epicondyle of humerus
I: Palmar aponeurosis of 2nd-5th metacarpals
A: Wrist flexion
N: Median n. (C6, C7)
Flexor carpi ulnaris
O: Medial epicondyle of humerus, posterior aspect of proximal ulna
I: Pisiform, hamate, and base of 5th metacarpal on palmar surface
A: Wrist flexion, ulnar deviation
N: Ulnar n. (C8, T1)
Flexor digitorum superficialis
O: Medial epicondyle of humerus
Ulnar head: Medial coronoid process
Radial head: Upper 2/3 of anterior border of the radius, distal to the radial tuberosity
I: Each tendon splits and attaches to the sides of the middle phalanx of the four fingers on the palmar surface
A: Flexion of the fingers at the MCP and PIP joints, wrist flexion
N: Median n. (C7, C8, T1)
Flexor digitorum profundus
O: Proximal 3/4 of anterior and medial ulna
I: Base of distal phalanges of digits 2-5
A: Flexion of digits 2-5 at MCP, PIP, and DIP joints; wrist flexion
N: Median n. (C8, T1) to 2nd and 3rd digits; Ulnar n. (C8, T1) to 4th and 5th digits
Flexor pollicis longus
O: Middle anterior surface of the radius, anterior medial border of the ulna distal to the coronoid process
I: Base of distal phalanx of thumb on palmar surface
A: Flexion of thumb CMC, MCP, and IP; Wrist flexion; Radial deviation
N: Median n. (C8, T1)
Extensor carpi ulnaris
O: Lateral epicondyle of humerus, middle posterior border of the ulna
I: Base of 5th metacarpal on dorsal surface
A: Wrist extension, ulnar deviation
N: Radial n. (C6, C7, C8)
Extensor carpi radialis brevis
O: Lateral epicondyle of humerus
I: Base of 3rd metacarpal on dorsal surface
A: Wrist extension; radial deviation
N: Radial n. (C6, C7)
Extensor carpi radialis longus
O: Distal 1/3 of lateral supracondylar ridge of humerus, lateral epicondyle of humerus
I: Base of 2nd metacarpal on dorsal surface
A: Wrist extension, radial deviation
N: Radial n. (C6, C7)
Extensor digitorum
O: Lateral epicondyle of humerus
I: Four tendons to bases of middle and distal phalanxes of digits 2-5
A: Extension of digits 2-5 at MCP joints
N: Radial n. (C6, C7, C8)
Extensor indices
O: Middle to distal 1/3 of posterior ulna
I: Base of middle and distal phalanx of the 2nd digit on the distal surface
A: Extension of index finger at MCP joint
N: Radial n. (C6, C7, C8)
Extensor digiti minimi
O: Lateral epicondyle of humerus
I: Base of middle and distal phalanx of the 5th digit on the dorsal surface
A: Extension of the little finger at the MCP joint
N: Radial n. (C6, C7, C8)
Extensor Pollicis Brevis
O: Posterior surface of lower middle radius
I: Base of proximal phalanx of thumb on dorsal surface
A: Extension of the thumb at the CMC and MCP joints; radial deviation; weak wrist extension
N: Radial n. (C6, C7, C8)
Abductor pollicis longus
O: Posterior aspect of radius and midshaft of ulna
I: Base of 1st metacarpal on the dorsal lateral surface
A: Abduction of the thumb at the CMC joint, radial deviation, extension of thumb at CMC joint
N: Radial n. (C6, C7)
