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GROSS ANATOMY

MUSCLES OF POSTERIOR FOREARM

QuestionAnswer
ORIGIN OF ABDUCTOR POLLICIS LONGUS POSTERIOR RADIUS, POSTERIOR ULNA, INTEROSSEOUS MEMBRANE
INSERTION OF ABDUCTOR POLLICIS LONGUS BASE OF 1ST METATARSAL
ACTION OF ABDUCTOR POLLICIS LONGUS ABDUCTION OF 1ST METACARPAL OF THUMB AT CM JOINT, ASSISTS WRIST ABDUCTION
INNERVATION OF ABDUCTOR POLLICIS LONGUS RADIAL NERVE
ACTING ALONG, THIS MUSCLE ABDUCTS THE THUMB IN A RADIAL DIRECTION AND SOME SOURCES DESCRIBE THIS ACTION AS EXTENSION OF THE THUMB AT CM JOINT ABDUCTOR POLLICIS LONGUS
WITH CONTINUED ACTION, THIS MUSCLE CAN ABDUCT THE WRIST ABDUCTOR POLLICIS LONGUS
ORIGIN OF SUPINATOR LATERAL EPICONDYLE OF HUMERUS, ANNULAR AND RADIAL COLLATERAL LIGAMENTS, PROXIMAL ULNA AT SUPINATOR CREST
INSERTION OF SUPINATOR LATERAL SURFACE OF PROXIMAL 1/3 OF RADIUS BETWEEN ANTERIOR AND POSTERIOR OBLIQUE LINES
INNERVATION OF SUPINATOR RADIAL NERVE
ACTION OF SUPINATOR SUPINATION OF FOREARM
THIS NERVE PASSES BETWEEN THE SUPERFICIAL AND DEEP LAYERS OF THE SUPINATOR RADIAL
SLOW, NON-RESISTED SUPINATION AND FOR SUPINATION WITH THE ELBOW EXTENEDED SUPINATOR
SPEED AND RESISTANCE REQUIRED IN SUPINATION BICEPS BRACHII REQUIRED
ORIGIN OF EXTENSOR CARPI RADIALIS LONGUS LATERAL SUPRACONDYLAR RIDGE, LATERAL EPICONDYLE OF HUMERUS
INSERTION OF EXTENSOR CARPI RADIALLIS LONGUS BASE OF 2ND METACARPAL
ACTION OF EXTENSOR CARPI RADIALLIS LONGUS EXTENSION, ABDUCTION OF WRIST (RADIAL DEVIATION)
INNERVATION OF EXTENSOR CARPI RADIALLIS LONGUS RADIAL NERVE
ACTING ALONE, THIS MUSCLE EXTENDS THE WRIST IN A RADIAL DIRECTION EXTENSOR CARPI RADIALIS LONGUS
ORIGIN OF EXTENSOR CARPI RADIALIS BREVIS LATERAL EPICONDYLE OF HUMERUS (COMMON EXTENSOR TENDON)
INSERTION OF EXTENSOR CARPI RADIALIS BREVIS BASE OF 3RD METACARPAL
ACTION OF EXTENSOR CARPI RADIALIS BREVIS EXTENSION OF WRIST
INNERVATION OF EXTENSOR CARPI RADIALIS BREVIS RADIAL NERVE
ACTING ALONG, THIS MUSCLE EXTENDS THE WRIST IN THE MIDLINE EXTENSOR CARPI RADIALIS BREVIS
ORIGIN OF EXTENSOR CARPI ULNARIS LATERAL EPICONDYLE OF HUMERUS (COMMON EXTENSOR TENDON), POSTERIOR PROXIMAL ULNA
INSERTION OF EXTENSOR CARPI ULNARIS BASE OF 5TH METACARPAL
ACTION OF EXTENSOR CARPI ULNARIS EXTENSION, ADDUCTION OF WRIST (ULNAR DEVIATION)
INNERVATION OF EXTENSOR CARPI ULNARIS RADIAL NERVE
ACTING ALONE, THIS MUSCLE EXTENDS THE WRIST IN AN ULNAR DIRECTION EXTENSOR CARPI ULNARIS
THE TENDON OF THIS MUSCLE RUNS THROUGH A GROOVE BETWEEN THE HEAD OF THE ULNA AND THE STYLOID PROCESS OF THE ULNA EXTENSOR CARPI ULNARIS
ORIGIN OF EXTENSOR DIGITORUM LATERAL EPICONDYLE OF HUMERUS (COMMON EXTENSOR TENDON)
INSERTION OF EXTENSOR DIGITORUM EXTENSOR EXPANSION OF 4 FINGERS
ACTION OF EXTENSOR DIGITORUM EXTENSION OF PROXIMAL PHALANGES OF 4 FINGERS AT MP JOINTS, ASSISTS EXTENSION OF WRIST
INNERVATION OF EXTENSOR DIGITORUM RADIAL NERVE
THIS MUSCLE DIVIDES INTO THE FOUR PROMINENT TENDONS ON THE DORSUM OF THE HAND EXTENSOR DIGITORUM
CONTRACTION OF THIS MUSCLE CONTINUED PAST FINGER EXTENSION WILL RESULT IN EXTENSION OF THE WRIST EXTENSOR DIGITORUM
ORIGIN OF EXTENSOR DIGITI MINIMI LATERAL EPICONDYLE OF HUMERUS (COMMON EXTENSOR TENDON)
INSERTION OF EXTENSOR DIGITI MINIMI EXTENSOR EXPANSION OF LITTLE FINGER
ACTION OF EXTENSOR DIGITI MINIMI EXTENSION OF PROXIMAL PHALANX OF LITTLE FINGER AT MP JOINT, ASSISTS EXTENSION OF WRIST
INNERVATION OF EXTENSOR DIGITI MINIMI RADIAL NERVE
THIS MUSCLE JOINS THE EXTENSOR DIGITORUM TENDON IN THE EXTENSOR EXPANSION EXTENSOR DIGITI MINIMI
ORIGIN OF EXTENSOR INDICIS POSTERIOR ULNA AND INTEROSSEOUS MEMBRANE
INSERTION OF EXTENSOR INDICIS EXTENSOR EXPANSION OF INDEX FINGER
ACTION OF EXTENSOR INDICIS EXTENSION OF PROXIMAL PHALANX OF INDEX FINGER AT MP JOINT, ASSISTS EXTENSION OF WRIST
INNERVATION OF EXTENSOR INDICIS RADIAL NERVE
4 DEEP MUSCLES ORIGINATING ON POSTERIOR RADIUS, ULNA AND INTEROSSEOUS MEMBRANE FROM MOST PROXIMAL TO DISTAL IN ORIGIN ABDUCTOR POLLICIS LONGUS, EXTENSOR POLLICIS BREVIS, EXTENSOR POLLICIS LONGUS, AND EXTENSOR INDICIS
ORIGIN OF EXTENSOR POLLICIS LONGUS POSTERIOR ULNA AND INTEROSSEOUS MEMBRANE-MIDDLE 1/3
INSERTION OF EXTENSOR POLLICIS LONGUS BASE OF DISTAL PHALANX OF THUMB
ACTION OF EXTENSOR POLLICIS LONGUS EXTENSION OF DISTAL PHALANX OF THUMB AT IP JOINT, ASSISTS WRIST ABDUCTION
INNERVATION OF EXTENSOR POLLICIS LONGUS RADIAL NERVE
THIS MUSCLE FORMS THE MEDIAL BORDER OF THE ANATOMICAL SNUFFBOX EXTENSOR POLLICIS LONGUS
ORIGIN OF EXTENSOR POLLICIS BREVIS POSTERIOR RADIUS, INTEROSSEOUS MEMBRANE
INSERTION OF EXTENSOR POLLICIS BREVIS BASE OF PROXIMAL PHALANX OF THUMB
ACTION OF EXTENSOR POLLICIS BREVIS EXTENSION OF PROXIMAL PHALANX OF THUMB AT MP JOINT, ASSISTS IN WRIST ABDUCTION
THIS MUSCLE FORMS THE LATERAL BORDER OF THE ANATOMICAL SNUFF BOX EXTENSOR POLLICIS BREVIS
ANATOMICAL SNUFFBOX DEPRESSION ON THE DORSUM OF THE 1ST METACARPAL, REPTEDLY USED TO HOLD SNUFF FOR SNIFFING BY GENTEEL PERSONS IN THE 1800'S
Created by: chengel