. Cunningham's Text-book of anatomy. Anatomy. MUSCLES ON THE DORSAL SUEFACE OF THE FOEEAEM. 395 bones respectively (Fig. 352, p. 394). Each ends in a tendon which is directed distally behind the deep transverse metacarpal ligament, to be inserted into the dorsal expansion of the extensor tendon, the capsule of the metacarpo-phalangeal articulation, and the side of the first phalanx of the finger; the first is inserted into the medial side of the second finger; the second and third into the lateral sides of the fourth and fifth fingers. The deep part of the flexor pollicis brevis (inter- osseus
. Cunningham's Text-book of anatomy. Anatomy. MUSCLES ON THE DORSAL SUEFACE OF THE FOEEAEM. 395 bones respectively (Fig. 352, p. 394). Each ends in a tendon which is directed distally behind the deep transverse metacarpal ligament, to be inserted into the dorsal expansion of the extensor tendon, the capsule of the metacarpo-phalangeal articulation, and the side of the first phalanx of the finger; the first is inserted into the medial side of the second finger; the second and third into the lateral sides of the fourth and fifth fingers. The deep part of the flexor pollicis brevis (inter- osseus primus volaris) is to be regarded as the homologous muscle of the first interosseous space. Mm. Interossei Dorsales.—The dorsal interossei are four in number. Each arises by two heads from the sides of the metacarpal bones bounding each in- terosseous space (Figs. 353, p. 394, and 354, p. 395). Each forms a fleshy mass, ending in a membranous tendon which, passing distally behind the deep transverse metacarpal ligament, is inserted exactly like the volar muscles into the dorsal aspect of each of the four fingers. The insertion of the first dorsal interosseous muscle is into the lateral side of the index finger; the second muscle is attached to the lateral side of the middle finger; the third Abductor pollicis brevis : origin (cut) - Insertion of flexor carpi radialis Insertion of opponens pollicis Interosseus primus volaris Abductor pollicis brevis : insertion (cut) Adductor pollicis obliquus (insertion) Adductor pollicis transversus (insertion) First dorsal interosseous muscle Second dorsal interosseous muscle Third dorsal interosseous muscle Fourth dorsal interosseous muscle. Insertion of flexor carpi ulnaris Origins of volar inter- osseous muscles Insertion of opponens digiti QULNTI Insertion of abductor digiti QUINTI Fig. 354.—Dorsal Interosseous Muscles of the Hand (seen from the Volar Aspect). muscle to the medial side of the same finger; and the fourth muscle to the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
