OCR Text |
Show 1894.] ANATOMY OF PALAMEDEA CORNUTA. 547 Flexor digitorum sublimis.-A strong band of tendon arises from the inner condyle of the humerus immediately below the origin of the pronator profundus. This band is attached by strong fasciae to the ulna, and runs parallel with that bone to be attached to the ulnar carpal bone. From the dorsal surface of this two inches above its insertion there arises by a small fleshy head the flexor sublimis. It is inserted by a tendon to the base of the second phalanx of the second digit. Flexor digitorum profundus.-This arises fleshy from the two middle quarters of the ulna. Its tendon is inserted halfway down the second phalanx of digit 2. Flexor carpi ulnaris.-This arises from the inner condyle of the humerus by a strong tendon in which there is a well-marked sesamoid ; it runs down the inner side of the ulnar to be inserted in the great tuberosity of the ulnar carpal bone. A thinner muscle arising from this passes into a tendon which is connected with the secondary feathers and is inserted alongside the great tendon of this muscle. Ulni-metacarpcdis ventralis.-This arises fleshy from the radial face of the last quarter of the ulna. Its tendon after passing over a groove in the radial carpal is inserted into the base of the first metacarpal proximal to the spur. Extensor brevis pollicis.-This small muscle arises fleshy from the base of metacarpal one ; it is inserted to the end of the first quarter of the phalanx of the thumb. Abductor pollicis.-This arises fleshy from the ventral surface of the tendon of the extensor metacarpi radialis; its insertion is fleshy to half of the first phalanx of the thumb. A ligament continuous with it runs to the second phalanx of the thumb. Flexor pollicis.-This arises fleshy between the root of the metacarpal spur and a knob on the ventral side of the metacarpal; its tendon is inserted on to the inner side of the base of the first phalanx of the thumb, but its fleshy belly gives rise to a slip of muscle which passes to the abductor indicis. Abductor pollicis.-This arises from the outer surface of the metacarpal just beyond the articulation of the thumb; its belly runs across and is inserted by slips to the feathers on the thumb having no connection with the thumb-bones. Abductor indicis.-This arises as a delicate fleshy slip from the flexor pollicis and from nearly the whole of the shaft of the second metacarpal. Its tendon is inserted at the base of the first phalanx. Flexor digiti III.-This arises fleshy from the last two-thirds of metacarpal 3, and its tendon is inserted at the base of the first phalanx. Radio-metacarpalis ventralis.-The tendon of origin comes from the lateral face of the distal end of the radius ; the muscular belly divides in two. The superficial division is inserted by a short broad tendon to the upper surface of metacarpal III. The deep division is inserted fleshy to immediately below the superficial tendon. |