MUSCLES OF THE LEG. 95 



tendinosus, semi-membranosus, gracilis, and sartorius, forming the Innet 

 Hamstring. Action, to flex the leg and rotate it outwards. Nerve, great 

 sciatic. 



Semi-tendinosus,/y)'fw the tuberosity of the ischium by a tendon 4 common 

 to it and the long head of the biceps, and from the adjacent aponeurosis, 

 into the shaft of the tibia at its upper and inner surface, its tendon curving 

 around the inner tuberosity. Action, to flex the leg upon the thigh. Nerve, 

 great sciatic. 



Semi-membranosus,^ from the tuberosity of the ischium above the origin ol 

 the above-named muscles, into the inner tuberosity of the tibia ; its tendon 

 dividing into 3 parts, one over the popliteus muscle, and another forming 

 the posterior ligament of the knee-joint. Action, to flex the leg, and rotate 

 it inwards. Nerve, great sciatic. 



External Rotators of the Hip-joint are 13^, the 3 ad 'nctors, pyriformis, a 

 obturators, 2 gemelli, quadratns femoris, pectineus, psoas magnus, iliacus, sar- 

 torius, and posterior half of the gluteus medius. 



Internal Rotators of the Hip-joint are 2^, the tensor vaginae femoris, gluteu* 

 minimus, and the anterior half of the gluteus medius. 



MUSCLES OF THE LEG. 



Muscles of the leg arranged in groups of threes. (Pancoast.) 

 Tibialus Anticus. Tibialus Posticus. 



Extensor Proprius Pollicis. Flexor Longus Pollicis. 



Extensor Longus Digitorum. Flexor Longus Digitorum. 



Gastrocnemius. Peroneus Longus. 



Soleus. Peroneus Brevis. 



Plantaris. Popliteus. Peroneus Tertius. 



Tibialis Anti'cus 3 (Flexor Tarsi Tibialis),/;w the outer tuberosity and upper 

 two-thirds of the shaft of the tibia externally, the interosseous membrane, 

 deep fascia, and intermuscular septum, through the inner canal in the 

 anterior annular ligament into the inner and plantar surface of the internal 

 cuneiform bone, and the base of the 1st metatarsal. Action, to flex the tarsus 

 on the leg, and elevate the inner border of the foot. Nerve, anterior tibial. 

 Extensor Proprius Pollicis, 5 from the middle two-fourths of the fibula ante- 

 riorly and the interosseous membrane, through the 2d canal in the anterioi 

 annular ligament, into the base of the last phalanx of the great toe. Action, 

 to extend that toe. Nerve, anterior tibia!. 



Extensor Longus Digitorum, 4 from the outer tuberosity of the tibia, the upper 

 three-fourths of the shaft of the fibula anteriorly, interosseous membrane, 

 deep fascia, and intermuscular septa, into the 2d and 3d phalanges of & * 



