. The anatomy of the domestic animals . Veterinary anatomy. 366 THE MUSCLES OF THE PIG MUSCLES OF THE LEG AND FOOT The peroneus tertius is a well-developed muscle which is in great part super- ficially situated on the front of the leg. It covers the long digital extensor, with which it is united except in the distal third of the leg. It arises from the extensor fossa of the femur by a common tendon with that muscle, a synovial pouch from the femoro-tibial joint extending down under the origin. This sac is an inch and a half or more (ca. 3 to 4 cm.) in length in large subjects and extends aroun
. The anatomy of the domestic animals . Veterinary anatomy. 366 THE MUSCLES OF THE PIG MUSCLES OF THE LEG AND FOOT The peroneus tertius is a well-developed muscle which is in great part super- ficially situated on the front of the leg. It covers the long digital extensor, with which it is united except in the distal third of the leg. It arises from the extensor fossa of the femur by a common tendon with that muscle, a synovial pouch from the femoro-tibial joint extending down under the origin. This sac is an inch and a half or more (ca. 3 to 4 cm.) in length in large subjects and extends around the lateral edge of the tendon to its superficial face, so as to make a partial sheath and underlie the origin of the peroneus longus also. The muscle is continued at the distal end of the leg by a strong tendon which passes over the flexion surface of the hock, between the tendon of the long extensor (lateral) and that of the tibialis anterior (medial), all three being bound down by a strong annular ligament which extends across from one malleolus to the other. It ends by two or more branches on the first and second tarsal and third metatarsal bones. Not rarely there is a thin tendon in- serted into the fourth metatarsal bone. The tendon usu- ally receives a small branch from that of the tibialis an- terior at the annular ligament. The tibialis anterior is smaller than the preceding. It arises from the lateral surface of the tuberosity and lateral condyle of the tibia. At the distal end of the leg the ten- don passes under the annular ligament mentioned above (where it detaches a small branch to the peroneus tertius), and ends on the second tarsal and the proximal end of the second metatarsal bone. The terminal part passes under a superficial laj'er of the medial ligament of the hock, and is provided with a bursa. The peroneus longus descends in front of the fibula and the lateral extensor. It arises chiefly from the lateral con- dyle of the tibia. The tendon of insertion de
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