ch. 8: O/I of Muscles of Forearm Flashcards
O/I of pronator teres (PT)
O: MED epicondyle of the humerus (above CFO), and coronoid process of the ulna (MED surface)
I: midlateral surface of shaft of radius
O/I of flexor carpi radialis (FCR)
O: MED epicondyle of humerus via CFT
I: base of 2nd and 3rd metacarpal (palmar surface)
O/I palmaris longus (PL)
O: MED epicondyle of humerus via the CFT
I: palmar carpal ligament and palmar aponeurosis
O/I flexor carpi ulnaris (FCU)
O: MED epicondyle via CFT, olecranon and POST border of ulna (SUP 2/3)
I: pisiform, hook of hamate and base of 5th metacarpal
which muscles of the forearm are superficial and of the ANT fascial compartment (4)
PT, FCR, PL, FCU
O/I of flexor digitorum superficialis (FDS)
O: MED epicondyle and coronoid process (MED side), oblique line of radius (ANT surface)
I: shaft of middle phalanges of the medial 4 digits (2-5)
O/I of flexor digitorum profundus (FDP)
O: PROX 2/3 of ANT surface of ulna and interosseous membrane
I: bases of DIST phalanges of 4 digits (2-5)
O/I of flexor pollicis longus (FPL)
O: ANT surface of radius (middle 1/2), interosseous membrane
I: base of DIST phalanx of thumb
O/I of pronator quadratus (PQ)
O: DIST 1/4 of ANT surface of ulna
I: DIST 1/4 of the ANT surface of radius (slightly DIST to origin)
deep muscles of the ANT fascial compartment (3)
FDP, FPL, PQ
O/I of brachioradialis (BR)
O: LAT supracondylar ridge of humerus (& LAT intermuscular septum)
I: base of styloid process of the radius
O/I of extensor carpi radialis longus (ECRL)
O: DIST 1/3 of the LAT supracondylar ridge
I: base of the 2nd metacarpal (dorsal surface)
O/I of extensor carpi radialis brevis (ECRB)
O: LAT epicondyle via CET
I: base of 3rd metacarpal (dorsal and radial surface)
O/I of extensor digitorum (ED)
O: LAT epicondyle via CET
I: middle and DIST phalanges of digits 2-5
O/I of extensor digiti minimi (EDM)
O: LAT epicondyle via CET
I: tendon of extensor digitorum on 5th digit (extensor expansion or hood)
O/I of extensor carpi ulnaris (ECU)
O: LAT epicondyle via common extensor tendon and POST border of ulna
I: base of 5th metacarpal (ulnar surface)
superficial muscles of POST fascial compartment of forearm (6)
BR, ECRL, ECRB, ED, EDM, ECU
O/I of supinator
O: LAT epicondyle, radial collateral and annular ligaments, and the supinator crest of the ulna
I: SUP 1/3 of the LAT and ANT surface of the radius
Abductor pollicis longus (AbdPL)
O: POST surface of middle of radius and ulna and interosseous membrane
I: base of the 1st metacarpal (lateral/radial side)
Extensor pollicis longus (EPL)
O: middle 1/3 of the POST surface of the ulna and the interosseous membrane
I: base of the DIST phalanx of the thumb
extensor pollicis brevis (EPB)
O: POST surface of the middle of the radius and interosseous membrane (DIST to AbdPL)
I: base of PROX phalanx of thumb
extensor indicis (EI)
O: DIST POST surface of ulna and interosseous membrane
I: tendon of extensor digitorum on the 2nd digit (extensor expansion or hood)
deep muscles of the POST facial compartment (forearm) (5)
supinator, AbdPL, EPL, EPB, EI
thenar intrinsic muscles of the hand (4)
abductor pollicis brevis, flexor pollicis brevis, opponens pollicis adductor pollicis
abductor pollicis brevis
O: flexor retinaculum, scaphoid and tubercle of the trapezium
I: base of PROX phalanx of thumb (LAT/radial aspect)
opponens pollicis
O: flexor retinaculum and trapezium
I: LAT shaft of first metacarpal (radial side)
flexor pollicis brevis
O: flexor retinaculum and trapezium
I: base of PROX phalanx of thumb (LAT/radial aspect)
adductor pollicis
O (Oblique head): capitate and bases of metacarpals 2 and 3
O (transverse head): 3rd metacarpal- ANT surface (palmar)
I: MED side of PROX phalanx of thumb
intrinsic muscles of the hand (hypothenar group) (4)
palmaris brevis, abductor digiti minimi, flexor digiti minimi brevis, opponens digiti minimi
palmaris brevis
O: flexor retinaculum and palmar aponeurosis
I: skin on the ulnar border of palm of hand
abductor digiti minimi
O: pisiform
I: base of PROX phalanx of 5th digit
flexor digiti minimi brevis
O: flexor retinaculum and hook of hamate
I: base of PROX phalanx of 5th digit
opponens digiti minimi
O: flexor retinaculum and hook of the hamate
I: MED border of shaft of 5th metacarpal
lumbricales
O: tendons of flexor digitorum profundus (off LAT aspect of 2nd-5th tendons and off MED aspect of 3rd & 4th tendons also)
I: extensor expansions (hoods) of digits 2-5
dorsal interosseii
O: adjacent sides of the shaft of the metacarpals (2 heads)
I: extensor expansions and bases of PROX phalanges of digits 2, 3, 4
palmar interosseii
O: palmar MED surface of the 2nd metacarpal and palmar LAT surface of 4th and 5th metacarpal (1 head)
I: extensor expansions and bases of PROX phalanges of digits 2, 4, and 5
