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Show 1894.] MAMMALIAN H A N D AND FOOT. 361 explanation of the two-headed lumbricales of higher mammals which, e.g. in Man, are so very often met with. 8. Extensores. The supinator longus (bracb io-radialis). The radialis ext. longus. The radialis ext. brevis. The extensor dig. comm. rad. s. subl. The extensor dig. comm. uln. s. prof. The extensor dig. IV. and V. {ext. minimi, Man.) The ulnaris externus. as in man. Origin. Humerus \ Humerus f Humerus ) Humerus, radius Ulna. Ulna. Humerus. Insertion. Pp., with tbe tendon of the abd. (ext.) pol. longus. Metacarpus II. Metacarpus III. digits 2-5. digits 1-3. 4th and 5th digits. Metacarpus V. and into volar ligaments. The prcepollex gets a very long nerve from the n. medianus, and vessels from the art. brachialis. 2. TRICHOSURUS VULPECULA. (Plate XXI. fig. 3.) o. Flexores. The ulnaris internus: origin, humerus and ulna; insertion, pisiform. The "palmaris longus" consists of two muscles, a superficial and a deeper one; the superficial one is inserted into the Pp. and the hgam. c. transv., some fibres going to the pisiform ; the deeper palmaris ends in the fascia palmaris (vide Plate XXI. fig.3). The flexor digitorum sublimis is weak ; it divides into four rather slender tendons which go to digits 2-5, mostly ending in the thin sheaths of the deep tendons. The flexor digitorum profundus is strong; it comes from the humerus and both ulna and radius. The five tendons spring from a united tendinous mass; they become almost superficial on the digits. There axe four lumbricales. Q. Extensores. The supinator longus, a strong muscle, arises from the humerus and is inserted on the radial side of the scaphoid (Pp.'?). The radiales externi longus and brevis are almost quite separated. N. medianus supplies the Pp.; a strong nerve goes to the dorsum of the hand for the supply of the thumb and the radial side of the 2nd digit. 3. MACROPUS BENNETTI. (Zool. Soc. Gardens, London.) The palmaris longus ends in a long narrow tendon which continues into a triangular aponeurotic expansion on the wrist, sending a distinct tendinous strip to the Pp., 3rd digit, and Pm.,- not only to the bones but also to the pads and even to the skin. Nerve-supply by the ulnaris. |
