OCR Text |
Show 274 MESSRS. B. C. A. WINDLE AND F. G. PARSONS ON [Nov. 3, always an arbitrary proceeding to settle whether a muscle is divisible or not. In the following animals no natural division was made out:-Hippopotamus (1), Pig (4, 11), Peccary (14), Chevrotain (20, 21, 22), Deer (25, 26), Elk (30), Ox (35), Sheep (42, 46), and Duiker-bok (54). A fairly distinct adductor longus, on the other hand, was found in the Giraffe (33), Harnessed Antelope (55), Tapir (62), Horse (63, 65, 67), Rhinoceros (70), Hyrax (74, 75, 78) (see text-fig. 26), and Elephant (81, 85). W e have not been able to satisfy ourselves of a single instance of the presence of an adductor brevis, for the muscle which is called by this name in the veterinary books is clearly the homologue of the human adductor longus. The adductor longus, when it is distinct, rises close to the anterior part of the symphysis, while the insertion is into the shaft of the femur, usually in its middle third. The rest of the adductor mass rises from the whole length of the subpubic ramus and is inserted into the lower half or two-thirds of the femur. The whole of the adductor mass is always supplied by the obturator nerve. Text-fig. 26. Muscles of inner side of Thigh of Hyrax. P.s. PECT. O.E. A.M. O.N. Gr. GT.SC.N. S.M. Psoas. Pectineus. Obturator externus. Adductor mass. Obturator nerve. Gracilis. Great sciatic nerve. Semimembranosus. P.S.M. Q.F. C.F. Bi. S.T. I.L.Lig. H.S. Presemimembranosus. Quadratus femoris. Femoro-coccvgeus. Biceps. Semitendinosus. Internal lateral ligament Ham-string. Gracilis {Adductor cruris).-This is a very constant muscle among the Ungulata; it rises as usual from the whole length of the symphysis and runs down as a single broad sheet to the usual insertion at the upper part of the inner surface of the tibia. Its tendon of insertion is generally more or less directly fused with |