Hand/Wrist Muscles Flashcards
Pronator Teres
O: medial epicondyle of humerus; coronoid process of ulna
I: middle/lateral surface of radius
A: pronated forearm and flexes it
N: median n, (C6, 7)
Flexor Carpi Radialis
O: medial epicondyle of humerus
I: base of 2nd metacarpal bone
A: flexes hand and abducts it
N: median n. (C6, 7)
Palmaris Longus
O: medial epicondyle of humerus
I: distal 1/2 of flexor retinaculum and palmar aponeurosis
A: flexes hand and tightens palmar aponeurosis
N: median n. (C7, 8)
Flexor Carpi Ulnaris
O: humeral- medial epicondyle of humerus; ulnar- olecranon and post. Border of ulna
I: pisiform bone, hook of hamate bone, 5th metacarpal bone
A: flexes hand and addicts it
N: ulnar n. (C7, 8)
Flexor Digitorum Superficialis
O: humeroulnar head- medial epicondyle of humerus, UCL, coronoid process of ulna; radial head- sup. 1/2 of ant radius
I: bodies of middle phalanges of medial four digits
A: flexes middle phalanges of medial 4 digits; stronger action flexes prox. Phalanges and hand
N: median n. (C7, 8, T1)
Flexor Digitorum Profundus
O: prox. 3/4 of medial and anterior surfaces of ulna and Interosseous membrane
I: bases of distal phalanges of medial 4 digits
A: flexes distal phalanges of medial 4 digits
N: medial- ulnar n. (C8, T1); lateral- median n. (C8, T1)
Flexor Pollicis Longus
O: anterior surface of radius and adjacent Interosseous membrane
I: base of distal phalanx of thumb
A: flexes phalanges of 1st digit (thumb)
N: anterior Interosseous n. (From median n.; C8, T1)
Pronator Quadratus
O: distal 1/4 of ant. Surface of ulna
I: distal 1/4 of ant. Surface of radius
A: probated forearm; deep fibers bind radius and ulna together assisting Interosseous membrane
N: anterior Interosseous n. (From median n.; C8, T1)
PRIMARY PRONATOR
Brachioradialis
O: prox. 2/3 of lateral supraepicondylar ridge of humerus
I: lateral surface of distal radius prox. To sty loud
A: flexes forearm
N: radial n. (C5, 6, 7)
Extensor Carpi Radialis Longus
O: lateral supracondylar ridge of humerus
I: base of 2nd metacarpal bone
A: extend and abduct hand at wrist joint
N: radial n. (C6, 7)
Extensor Carpi Radialis Brevis
O: lateral epicondyle of humerus
I: base of 3rd metacarpal bone
A: extend and abduct hand at wrist joint
N: deep branch of radial n. (C7, 8)
Extensor Digitorum
O: lateral epicondyle of humerus
I: extensor expansion of medial 4 digits
A: extends medial 4 digits at MCP, PIP, and DIP; extends hand at wrist
N: posterior Interosseous n. (C7, 8)- branch of radial n.
Extensor Digiti Minimi
O: lateral epicondyle of humerus
I: extensor expansion of 5th digit
A: extends digit 5 at MCP, PIP, DIP
N: posterior Interosseous n. (C7, 8)- branch of radial n.
Extensor Carpi Ulnaris
O: lateral epicondyle and post. Border of ulna
I: base of 5th metacarpal
A: extends wrist and ulnar deviates hand and wrist
N: posterior Interosseous n. (C7, 8) -branch of radial n.
Anyone us
O: lateral epicondyle of humerus
I: lateral surface of olecranon and superior part of posterior surface of ulna
A: assists triceps in extending elbow joint; stabilizes elbow; abducts ulna during pronation
N: radial n. (C7, 8, T1)
Supinator
O: lateral epicondyle of humerus, RCL and annular ligaments; Supinator fossa and crest of ulna
I: lateral, posterior, and anterior surfaces of proximal 1/3 of radius
A: Supinator forearm (in non-forceful supination)
N: deep branch of radial n. (C7, 8)
Abductor Pollicis Longus
O: posterior surfaces of ulna and radius and Interosseous membrane
I: base of 1st metacarpal
A: abducts thumb and extends it at CMC joint
N: posterior Interosseous n. (C7, 8)
Extensor Pollicis Brevis
O: post. Surface of radius and Interosseous membrane
I: base of prox. Phalanx of thumb via. Extensor expansion
A: extends thumb; prox. Phalanx at MCP joint
N: posterior Interosseous n. (C7, 8)
Extensor Pollicis Longus
O: post. Surface of middle of ulna and Interosseous membrane
I: base of distal phalanx of thumb via extensor expansion
A: extends distal phalanx of thump at IP joint and MCP joint
N: post. Interosseous n. (C7, 8)
Extensor Indices
O: post. Surface of ulna and Interosseous membrane
I: Extensor expansion of 2nd digit
A: extends index finger independently; assists in wrist extension
N: post. Interosseous n (C7, 8)
Abductor Pollicis Brevis
O: flexor retinaculum and tubercles of scaphoid and trapezium bone
I: lat. side of base of prox. Phalanx of thumb
A: abducts thumb and helps oppose it
N: recurrent branch of median n (C8, T1)
Flexor Pollicis Brevis
O: superficial- flexor retinaculum and tubercle of trapezium; deep= floor of carpal tunnel
I: lat. side of base of prox. Phalanx of thumb
A: flexes thumb
N: sup head- recurrent branch of median n. (C8, T1); deep- deep branch of ulnar n. (C8, T1)
Opponens Pollicis
O: flexor retinaculum and tubercle of trapezium
I: Lat. side of base of prox. Phalanx of thumb
A: opposes thumb toward center of palm and rotates it Medially
N: recurrent branch of median n. (C8, T1)
Adductor Pollicis
O: oblique- bases of metacarpals 2, 3, capitate and adjacent carpal bones; transverse- ant. Surface of 3rd metacarpal
I: med. side of base of prox. Phalanx of thumb
A: addicts thumb toward middle digit
N: deep branch of ulnar n. (C8, T1)
Abductor Digiti Minimi
O: pisiform bone
I: medial side of base of prox. Phalanx of digit 5
A: abducts digit 5
N: deep branch of ulnar n. (C8, T1)
Flexor Digiti Minimi Brevis
O: hook of hamate bone and flexor retinaculum
I: med. side of base of prox. Phalanx of digit 5
A: flexes prox. Phalanx of digit 5
N: deep branch of ulnar n. (C8, T1)
Opponens Digiti Minimi
O: hook of hamate bone and flexor retinaculum
I: med. border of 5th metacarpal
A: draws 5th metacarpal bone Anteriorly and rotates it bringing digit 5 into opposition to thumb
N: deep branch of ulnar n. (C8, T1)
Lumbricals 1 and 2
O: Lat. two tendons of flexor Digitorum Profundus (index and middle finger)
I: Lat. sides of extensor expansion of digits 2 and 3
A: flex digits at metac
