OCR Text |
Show 1874.] MYOLOGY OF PHRYNOSOMA. 87 Soleus (fig. 6, So.), the most superficial muscle on the back of the leg, arises from the posterior surface of the head of the tibia; the semitendinosus is inserted close to its origin, and gives off a tendon which borders its inner edge. The muscle in question terminates in a broad thin membranous tendon which is lost over the tarsus, but is more particularly attached to the cuboid and outer side of the metatarsal bone of the fifth digit; this appears to be the tibial head of the soleus, the gastrocnemius not being represented. This muscle Arrangement of the tendons surrounding the knee-joint. X 3. is not present in L. belli, but is met with in P. japonicum, where it was named extensor tarsi, and where its origin accords more with one head of the soleus of anthropotomy in arising from the middle of the shaft instead of from the head of the tibia. Flexor per for atus digitorum (fig. 5, F.S.) arises from the outer condyle of the femur. It ends in two bellies, one of which joins the deep flexor; the other expands into a broad tendon, which is attached on one side of the tarsus to the cuboid, and on the other to the tibial side of the astragalo-calcaneus. From this broad tendon two muscles continue on to the sole : these are perforated for the passage of the perforans tendon, one being inserted on each side of the base of the first phalanx of the first digit, the other on each side of the base of the first phalanx of the second digit. The third digit also has a perforatus ; but this arises independently from the cuboid, and is inserted like the other two : the fourth and the fifth digits have no perforatus. Peronaus primus (fig. 5, P.P.), like that of L. belli, arises from the external condyle of the femur by a flat but narrow tendon, expands in the leg into an elongated muscular mass, and terminates in a long thin tendon which is inserted into the cuboid. |