194 



THE SKELETON. 



Styloid process. 



Fibula. 



at the anterior margin of the inner 

 malleolus. This border is very 

 prominent in the upper two-thirds 

 of its extent, smooth and rounded 

 below. It presents a very flexuous 

 course, being usually curved out- 

 ward above and inward below ; it 

 gives attachment to the deep fascia 

 of the leg. 



The internal border is smooth 

 and rounded above and below, but 

 more prominent in the centre ; it 

 commences at the back part of the 

 inner tuberosity, and terminates at 

 the posterior border of the internal 

 malleolus ; its upper part gives at- 

 tachment to the internal lateral liga- 

 ment of the knee to the extent of 

 about two inches, and to some fibres 

 of the Popliteus muscle ; its middle 

 third to some fibres of the Soleus and 

 Flexor longus digitorum muscles. 



The external border, or inter- 

 osseous ridge, is thin and prominent, 

 especially its central part, and gives 

 attachment to the interosseous mem- 

 brane ; it commences above in front 

 of the fibular articular facet, and 

 bifurcates below, to form the bounda- 

 ries of a triangular rough surface, for 

 the attachment of the interosseous 

 ligament connecting the tibia and 

 fibula. 



The internal surface is smooth, 

 convex, and broader above than 

 below ; its upper third, directed for- 

 ward and inward, is covered by the 

 aponeurosis derived from the tendon 

 of the Sartorius, and by the tendons 

 of the Gracilis and Semitendinosus, 

 all of which are inserted nearly as 

 far forward as the anterior border ; 

 in the rest of its extent it is sub- 

 cutaneous. 



The external surface is narrower 

 than the internal ; its upper two- 

 thirds presents a shallow groove for 

 the attachment of the Tibialis an- 

 ticus muscle ; its lower third is 

 smooth, convex, curves gradually 

 forward to the anterior aspect of 

 the bone, and is covered from 

 within outward by the tendons of 

 the following muscles : Tibialis an- 

 ticus, Extensor proprius hallucis, Extensor longus digitorum. 



The posterior surface (Fig. 134) presents, at its upper part, a prominent ridge, 

 the oblique line of the tibia, which extends from the back part of the articular 



FIG. 134. Bones of the right leg. Posterior surface. 



