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groove; tlie external face shows tlie siibtrocliiinterian 

 crest and belo^y<-^:he suscondjloid fossa ; the internal 

 face shows the small troclianter, the medullary fora- 

 men surrounded by muscular imprints, the origin of 

 the vascular groove of the posterior face and the sus- 

 condyloid crest. Extremities : The superior lias an 

 articular head and neck, a great trochanter with apex, 

 convexity, and crest, and posteriorly the trochante- 

 rian fossa; the inferior has a wide trochlea, with inter- 

 nal border the highest, two condyles separated by 

 intercond^doid notch, two foss?e on the outside of ex- 

 ternal condyle, a rough , impression on the .inside of 

 the internal condyle, and a large tubercle outwards; 

 between the external condyle and trochlea a digital im- 

 pression for muscular attachments. Development : 

 four nuclei of ossification. 



Le^.— Tibia. — Division : Body and two extremities. 

 Body has three faces and three borders. The external 

 face is smooth and concave ; the hiternal slightly con- 

 vex and with muscular imprints above ; the posterior 

 offers two trian2;ular surfaces with rouirh muscular 

 lines, and on their limits the medullary foramen. The 

 anterior border forms the tibial crest; the external, the 

 til)ial arch ; the internal is thick and rounded. Ex- 

 tremities : the superior has three tuberosities; the ante- 

 rior or the tibial tuberosity has a depressed centre ; the 



