THE ANKLE 



1461 



lower end of this and the ankle-joint, it passes over the medial side of the tarsus, 

 to be inserted into the medial and lower part of the first cuneiform and the ad- 

 jacent part of the first metatarsal. (2) The extensor hallucis longus. This ten- 

 don, concealed above, appears low down in a line just lateral to the last, and then, 

 crossing over the termination of the anterior tibial vessels and nerves (to which 

 its muscular part lies lateral), it descends along the medial part of the dorsum to 

 be inserted into the base of the last phalanx of the great toe. (3) and (4) The 

 extensor digitorum longus and peroneus tertius enter a common sheath in the 

 transverse crural ligament. The former then divides into four tendons, which 



Fig. 1176. — ^Lateral View of the Ankle Region, as Shown by the ROntgen-rays 



run to the four lateral toes. The peroneus tertius is inserted into the upper 

 surface of the base of the fifth (often also the fourth) metatarsal bone. 



(B) Behind.— The tendo Achillas, the thickest of all tendons, begins near the 

 middle of the leg, in the junction of the tendons of the gastrocnemii and, a little 

 lower, (p. 1453) the soleus. Very broad at its commencement, it gradually nar- 

 rows and becomes verv thick. About 3 . 7 cm. (li in.) from the heel, or about the 

 level of the medial malleolus, is its narrowest point. After this it again expands 

 slightly, to be inserted into the middle of the back part of the calcaneus. The 

 long tendon of the plantaris runs along its medial side, to blend with it or to be at- 

 tached to the calcaneus. On either side of the tendo AchiUis are well-marked 



