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Show 644 MR. W. F. R. WELDON ON THE [Dec. 18, of the ulna through the distal fourth of its length, and passes over dorsal groove in the radial carpal bone to the tubercle on the outer side of the thumb metacarpal. 26. The flexor carpi ulnaris arises from the inferior portion of the internal condyle of the humerus ; it is fleshy for half its length, and then sends a tendon to the tubercle of the ulnar carpal. 27. The extensor indicis et poliicis arises from the outer condyle, and is inserted on the basal phalanx of the index finger, the tendon giving a branch to the thumb. 28. The extensor proprius indicis arises from two thirds of the distal half of the interosseous border of the radius ; it crosses the tendon of tbe ext. ind. et poll, to go to the base of the distal phalanx of the index. About the middle of its course through the hand, the tendon is joined by a slender muscular slip arising from the capsule of the tarso-metatarsal joint. 29. Flexor indicis I arises from the deep surface of the proximal half of the ulnar fascia, going over a groove in the ulna to the upper surface of the second phalanx of the index. 30. Flexor indicis II arises from the proximal half of the deep surface of the ulna, and goes to the base of the second phalanx of the index. 31. Brachialis anticus arises from the outer part of the anterior surface of the humerus, between the epicondylar ridges, and inserted to the inuer margin of the ulna by a fleshy insertion two inches long. 32. The pronator longus has a tendinous origin, superficially to all other muscles, from the inner condyle of the humerus ; its insertion into the humerus is very long. 33. Pronator brevis lies below the long pronator, and has similar attachments. 34. The supinator arises from the outer condyle above the extensor indicis et poliicis, and is inserted into about four inches of the superior margin of the radius. 35. The extensor brevis poliicis arises from the proximal dorsal tubercles of the thumb metacarpal, and goes to the dorsal edge of the base of its phalanx. There are two abductors and one short flexor of the thumb. B. MUSCLES OF THE HIND LIMB. 1. The sartorius arises from the anteroinferior margin of the crista ilii, and is not attached to any dorsal vertebra; it is inserted into the tibia on the inner side of the triceps tendon. 2. The tensor fascia arises from the gluteal fascia in front of the acetabulum only in Leptoptilus, though in some Storks (Ciconia) its origin extends behind the acetabulum. It is inserted into the fascia covering the rectus femoris. 3. The biceps arises from nearly the whole of the postacetabular ridge of the ilium ; its tendon, after passing through the usual sling, goes to the fibula, about two and a half inches below the head. |
