The =shaft= or =body= (Corpus femoris) is in general cylindrical, but flattened behind, and larger above than below. The =anterior= and =lateral surfaces= are continuous and strongly convex from side to side; there is often a central vertical rough line on the proximal part, but otherwise these surfaces are smooth. They are covered by the quadriceps femoris muscle. The =posterior surface= is wide, flat, and smooth in its proximal fourth. Below this part there is a rough elevation externally for the attachment of the femoral tendon of the biceps femoris, and a rough line internally to which the quadratus femoris is attached. The middle third is narrower, and is rough for the attachment of the adductor muscle. Just below this area an oblique groove crosses the surface, indicating the position of the femoral vessels. The =internal border= bears on its proximal part the =internal trochanter= or =trochanter minor=, a thick rough ridge, to which the ilio-psoas muscle is attached. From this a rough line curves up to the front of the neck and indicates the limit of the attachment of the vastus internus muscle. A narrow rough area about the middle gives attachment to the pectineus muscle, and the =nutrient foramen= is usually found just in front of this mark. The =supracondyloid crest= is situated below the groove for the femoral vessels, and gives origin to the inner head of the gastrocnemius. The =external border= is prominent in its upper part, and bears at the junction of its proximal and middle thirds the =external= or =third trochanter= (Trochanter tertius); this process is curved forward, and furnishes insertion to the tendon of the superficial gluteus muscle. At the lower part is found the =supracondyloid= or =plantar fossa= (Fossa plantaris), in which the superficial flexor arises; it is bounded externally by a thick rough margin, to which the outer head of the gastrocnemius muscle is attached. [Illustration: FIG. 63.—RIGHT FEMUR OF HORSE, EXTERNAL VIEW. ] [Illustration: FIG. 64.—RIGHT FEMUR OF HORSE, POSTERIOR VIEW. ] [Illustration: FIG. 65.—RIGHT FEMUR OF HORSE, INTERNAL VIEW. _1_, Anterior part, _1′_, posterior part of trochanter major; _2_, neck; _3_, fovea capitis; _4_, crest; _5_, trochanteric fossa; _6_, external or third trochanter; _7_, trochanter minor; _8_, eminence for attachment of biceps femoris; _9_, internal border; _10_, nutrient foramen; _11_, groove for femoral vessels; _12_, supracondyloid crest; _13_, supracondyloid fossa; _14_, trochlea; _15_, external epicondyle; _16_, external condyle; _17_, extensor fossa; _18_, internal condyle; _19_, internal epicondyle; _20_, intercondyloid fossa. (After Schmaltz, Atlas d. Anat. d. Pferdes.) ]