OCR Text |
Show 556 MR. j. B E S W I C K - P E R R I N O N T H E [June 20, small and entirely fleshy muscle ; it joins the preceding. The conjoined muscle is inserted by a very short and strong tendon into the lesser trochanter of the femur. The sartorius arises from the upper third of the acetabular border of the ilium. It is inserted into the inner side of the patella, and into the shaft of the tibia immediately below the tuberosity. The tendinous expansion at the knee-joint is united to the ligamentum patellae, and, stretching across the antero-lateral aspect of the joint, forms a protective covering to it. The gracilis, three addudores, and pectineus present no peculiarities, except that the former is a very extensive muscle, and the adductor magnus is entirely fleshy, the femoral artery passing through a muscular canal and not a tendinous one as in the human subject. The rectus has only one tendon of origin. It is inserted into the patella. The latter is not developed in the tendon of the rectus, but rather in the tendon formed by the conjoined vasti and crureus. There is no subcrureus ; the arrangement of the extensors of the leg presents no other peculiarities. The semimembranosus arises from the ischial tuberosity by a flat tendon half an inch wide. It is inserted into a depression on the inner surface of the tibia, immediately below the tuberosity, passing behind the internal lateral ligament. Its tendon of insertion is about a quarter of an inch long, the rest of the muscle being fleshy. The semitendinosus arises by two portions-one from the transverse processes of the third and fourth caudal vertebrae by a continuous tendinous process, and the other from the tuber ischii. These two heads unite about an inch and a quarter below their origin, forming a large muscle which is inserted into the middle of the inner surface of the shaft of the tibia. From the caudal origin, opposite its point of juuction with the ischial factor, a long slender muscle is given off, which courses along the outer and posterior border of the gluteus maximus muscle as far as the lower end of the femur, into which it is inserted immediately above the external condyle. This is a very peculiar muscle; I have only once met with the homologue of this slip in the human subject, a moderately muscular female cet. nineteen. It had not, however, the disposition as described in the Kinkajou. It arose from the long factor of the biceps femoris, and joined the semitendinosus immediately above the internal femoral condyle. The biceps femoris arises by two heads-one, the ischial, by a pointed tendon from the tuberosity, the other from the transverse process of the second caudal vertebra, immediately anterior to the caudal factor of the semitendinosus. The former constitutes a broad, expanded muscle, increasing in width as it passes downwards. It terminates in a broad, expanded tendon, which is inserted into the head of the fibula and into the fascia of the leg to the extent of an inch and a quarter below this point; the latter, or caudal factor of the biceps, runs parallel with the preceding, and terminates along with its lower fibres in the fascia of the leg, reaching as low down as within an inch of the ankle-joint. There are no special peculiarities in the quadratus femoris, obtu- |