THE TIBIA. 



247 



ice is well defined in front, but is 

 convexity of its posterior part, 

 jtween the two condylic surfaces 

 le bone is raised in the centre 



form the intercondyloid eminence 

 which consists of two intercondyloid 

 tubercles separated by an oblique 

 groove, in the anterior part of which 

 lies the anterior cruciate ligament. 

 The medial tubercle (tuberculum 

 intercondyloideum mediale), the 

 higher, is prolonged backwards and 

 laterally by an oblique ridge to 

 which part of the posterior cornu 

 of the lateral meniscus is attached. 

 The lateral tubercle (tuberculum 

 intercondyloideum laterale) is more 

 pointed and not so elevated. In front 

 of and behind the intercondyloid 

 eminence the articular areas are 

 separated by two irregular V-shaped 

 surfaces, the intercondyloid fossae. 

 The anterior intercondyloid fossa, 

 the larger and wider, furnishes areas 

 for the attachment of the menisci on 

 either side, and for the anterior 

 cruciate ligament immediately in 

 front of the intercondyloid emin- 

 ence. The floor of this space is 

 pierced by many nutrient foramina. 

 The posterior intercondyloid fossa is 

 concave from side to side, and 

 slopes downwards and backwards. 

 The lateral meniscus is attached 

 near its apex to a surface which 

 rises on to the back of the inter- 

 condyloid eminence; the medial 

 meniscus is fixed to a groove which 

 runs along its medial edge, and the 

 posterior cruciate ligament derives 

 an attachment from the smooth 

 posterior rounded surface. 



The lateral condyle is the 

 smaller of the two. It overhangs 

 the body to a greater extent than 

 the medial, though this is- obscured 

 in the living by its articulation 

 with the fibula. The facet for the 

 fibula, often small and indistinct, 

 is placed postero- laterally on the 

 distal surface of its most projecting 

 part.' Antero-laterally the imprint 

 caused by the attachment of the 

 trachis iliotibialis (O.T. ilio-tibial 

 band) is often quite distinct. Curv- 

 ing distal ly and forwards from the 

 fibular facet there is often a definite 

 ridge for the attachment of the 

 expansion of the biceps tendon ; 



rounded off behind, thus markedly increasing 



INTERCONDYLOID 



Tractus iliotibialis EMINENCE 



LATERAL 



HEAD 



NECK 



MEDIAL 

 CONDYLE 



ANTERIOR CREST 



POSTERIOR PART 

 OF MEDIAL 



SURFACE 



ANTERIOR PART OF 



MEDIAL SURFACE 



SUBCUTANEOUS 



SURFACE 



LATERAL 

 MALLEOLUS 



*^r 



FIG. 247. THE RIGHT TIBIA AND FIBULA AS SEEN 



FROM THE FRONT. 



The anterior part of the medial surface of the fibula is coloured 

 blue. The posterior part of the medial surface of the fibula 

 is coloured red. The lateral or peroneal surface of the fibula 

 is left uncoloured. 



