| OCR Text |
Show 1885.] MYOLOGY OF THE WATER-OPOSSUM. 11 Supinator brevis.-Arises from external condyle of humerus. Its upper fibres pass in a sling-like manner round head of radius, whilst its lower fibres pass obliquely downwards and inwards and are inserted into surface of radius external to its oblique line. Muscles of Hand. Dorsal group.-Abductor poliicis.- Arising from annular ligament, trapezium, and scaphoid, slightly united at its origin with flexor brevis poliicis ; inserted into outer side of base of first phalanx of thumb. Abductor minimi digiti.-Much larger than preceding, arising by Fig. 1. CM CO Myology of Water-Opossum. i?., rhomboideus ; S.M., serratus magnus; D., deltoid ; T.Ma,, teres O.H., omo-hyoid ; O.a., omo-atlantic ; S. Sp., supra-spinatus ; I.s., ; Tp., trapezius; T.Mi., teres minor; TV., triceps; L.S., levator scapulse; Sb., subclavius ; CM., cleido-mastoid; CO., cleido-occipital; C.B., coraco-brachialis ; BL. biceps. two heads from annular ligament and pisiform. Inserted into base of first phalanx of minimus. First dorsal interosseous.-Arises from palmar surface of metacarpal of thumb. Inserted into radial side of first phalanx of index. Second dorsal interosseous.-Arises from radial side of base of metacarpal of medius, and ulnar side of metacarpal of index in its whole length. Arched tendon, the larger end being inserted into radial side of base of first phalanx of medius, and the smaller end passing on to palmar surface of metacarpal of index. |
