| OCR Text |
Show 522 MR. F. E. BEDDARD ON THE BRAIN AND [June 14, delicate tendon (18 mm. long) from the ulnar head of the flexor profundus; it splits into three delicate nearly equi-sized tendons of insertion ; of these the two outer are the thickest. The Flexor profundus digitorum is composed of four parts : the largest arises from the flexor condyle; this gives off a branch about 15 m m , from its origin, which ends in a thin tendon apparently inserted into the palmar cartilage; the main muscle passes into a thick yellowish tendon which immediately joins that formed by the other divisions: the second head of the muscle arises from the middle of the shaft of the ulna ; it becomes tendinous on the lower surface just.before joining the others ; there is also another smaller condylar head, which is soon joined by a head arising from the shaft of the radius; these divide into four tendons. The Extensores carpi radialis brevier and longior are precisely as described by Messrs. Murie and Mivart in the Agouti; so, too, the Extensor ossis metacarpi pollicis. There were no traces that I could discover of the Extensor primi or secundi internodii pollicis. The Pronator quadratus is extensive, occupying nearly the whole of the shaft of the arm-bones. The Extensor carpi ulnaris arises from the extensor condyle by a strong tendon on one surface and by a few fibres from the ulna; its strong tendon of insertion, which is 15 m m . long, is rounded. The Extensor indicts is a small muscle; it arises from the middle of the ulna, and then becomes fused with the extensor mass. The Extensor minimi digiti supplies digits IV. and V. The Extensor communis digitorum divides early into three muscular bellies: two of these pass into tendons, which supply digits IV. and V. respectively; the tendon of the third splits into two, which go to digits II. and III. The outside of the thigh is covered by a thick muscular mass, composed of several elements which are not to be very easily distinguished ; a tendinous line separates the Biceps from the rest; the latter mass probably represents the Tensor vaginee femoris, the Gluteeus maximus, and the Sartorius. It is largely tendinous at its origin from the vertebral spines; the compound muscle is partly inserted on to the fascia covering the knee-joint; it is also inserted by a strong tendon on to the lower margin of the femur, just in front of the insertion of the Gluteeus medius: I consider that this part of the compound muscle is undoubtedly the Gluteeus maximus. The Biceps is an enormous fleshy mass; it has the usual double origin and is inserted along the whole of the leg chiefly to the fascia covering the leg, but also in front by a short tendon to the patella. The Gracilis is a double muscle; the two parts run side by side, arising from the symphysis pubis close together; they are also inserted close together on to the fascia covering the leg. The Semimembranosus is composed of two distinct parts : the first part has a strong tendinous attachment to the inner condyle of the femur; the second part is a long thin muscle from the caudal vertebrae and is inserted just between the two heads of the |
