THE TIBIA 



25^ 



the Semimembranosus. Its medial 

 surj 'aceis convex, rough, and promi- 

 nent; it gives attachment to the 

 tibial collateral ligament. The lat- 

 eral condyle presents posteriorly a 

 flat articular facet, nearly circular 

 in form, directed downward, back- 

 ward, and lateralward, for articu- 

 lation with the head of the fibula. 

 Its lateral surface is convex, rough, 

 and prominent in front: on it is 

 an eminence, situated on a level 

 with the upper border of the tuber- 

 osity and at the junction of its 

 anterior and lateral surfaces, for 

 the attachment of the iliotibial 

 band. Just below this a part of 

 the Extensor digitorum longus 

 takes origin and a slip from the 

 tendon of the Biceps femoris is 

 inserted. 



The Body or Shaft (corpus tibia). 

 The body has three borders and 

 three surfaces. 



Borders. The anterior crest or 

 border, the most prominent of the 

 three, commences above at the 

 tuberosity, and ends below at the 

 anterior margin of the medial 

 malleolus. It is sinuous and 

 prominent in the upper two-thirds 

 of its extent, but smooth and 

 rounded below; it gives attach- 

 ment to the deep fascia of the leg. 



The medial border is smooth and 

 Bounded above and below, but 

 more prominent in the center; it 

 begins at the back part of the 

 medial condyle, and ends at the 

 posterior border of the medial 

 malleolus; its upper part gives 

 attachment to the tibial collat- 

 eral ligament of the knee-joint 

 to the extent of about 5 cm., 

 and insertion to some fibers of 

 the Popliteus; from its middle 

 third some fibers of the Soleus 

 and Flexor digitorum longus take 

 origin. 



I The interosseous crest or lateral 

 Border is thin and prominent, espe- 

 cially its central part, and gives at- 

 tachment to the interosseous mem- 

 brane; it commences above in front 

 )f the fibular articular facet, and 

 17 



Articular capsule 



l condyle 



Styloid process ' 



Fibular 

 collateral' 

 ligament 



,Je 



Articular 

 capsule 



tnJ S>, 



Medial malleolus 



Lateral malleolus 

 FIG. 258. Bones of the right leg. Anterior surface. 



