280 



MUSCLES OF THE LOWER LIMB. 



it reaches the bend of the ankle, glides in a synovial sheath beneath the 

 anterior annular ligament, and is inserted into the inner and lower part of 

 the internal cuneiform and the contiguous extremity of the first metatarsal 

 bone, dividing slightly into two slips as it descends. 



Fig. 213. Fi S- 213 - MUSCLES OF THE LOWER LEG AND FOOT 



FROM BEFORE. 



1 , tendon of the rectus femoris ; 1', ligamentum pa- 

 tellae ; 2, the lower part of the vastus internus ; 3, 

 f-M lower part of the vastus externus ; 4, lower part of the 



sartorius ; 5, small portion of the fascia lata cut near the 

 place of its insertion at the knee ; 6, inner head of the 

 gastrocnemius ; 7, inner part of the soleus ; 8, tibialis 

 anticus ; 8', its tendon near the insertion ; 9, part of 

 the extensor longus pollicis; 9', its tendon; 10, ex- 

 tensor communis digitorum longus ; 10', placed on the 

 anterior annular ligament over the place of passage of 

 the four tendons of the extensor communis; 11, pero- 

 neus longus ; 12, peroneus brevis ; 13, peroneus tertius ; 

 13', tendon of the peroneus tertius at its insertion ; 14, 

 origin of the extensor communis digitorum brevis, the 

 first head of which is seen passing to the great toe near 

 the line from 9'. 



The extensor proprius pollicis placed be- 

 tween the tibialis anticus and the extensor 

 longus digitorum, arises from the middle three- 

 fifths of the anterior narrow part of the inner 

 surface of the fibula, and from the contiguous 

 portion of the interosseous ligament for the 

 same extent. The fleshy fibres run obliquely 

 forwards into a tendon placed at the anterior 

 border of the muscle ; and the tendon, after 

 passing beneath the upper, and through the 

 lower portion of the annular ligament in a dis- 

 tinct compartment, and along the dorsum of 

 the foot, is inserted into the base of the ter- 

 minal phalanx of the great toe. A delicate 

 expansion given off from the tendon on each 

 side spreads over the joint between the meta- 

 tarsal bone and the first phalanx. 



This muscle is partly concealed by those between 

 which it is placed. It lies external to the anterior 

 tibial artery in the leg, but crosses in front of that 

 vessel at the bend of the ankle, and is internal to it 

 on the foot. 



14 

 13- 



The extensor longus digitonvm, pedis, is 

 situated in contact with the tibialis anticus 

 above, and between the extensor proprius 

 pollicis and peroneus tertius below ; it arises 

 from the external tuberosity of the tibia ; 



from the head and the anterior narrowed part of the inner surface of the 

 fibula in front of the interosseous membrane, for about three fourths of its 

 length ; from a small part of the iuterosseous ligament at its upper part ; 

 also from the aponeurotie septa intervening between it and the muscles on 



