THE FEMUR. 
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internal ; its articular surface is also broader: the internal presents a 
tuberosity on its inner surface. 
Vie. 33.—Tuz Femur PARTIALLY DETACHED FROM THE COTYLOID CAVITY. 
A. External view of posterior half of the os in- B. External view of the right femur. 
nominatum. 4. Head of the femur (round-bone). 
a. Rough surface for the attachment of 5. Trochanter major externus, 
muscles. 6. Tubercle on the head of the femur. 
b. Cotyloid rim. 7. Trochanter minor externus. 
c. Tuberosity of the ischium. 8. Fossa for muscular insertion. 
1. Cotyloid cavity. 9. 9. Trochlear surfaces for articulation with 
2. Depression in which the round ligament the patella (knee-cap). 
(ligamentuin teres) is fixed. 10. External condyle. 
8. Obturator hole. 11. Surfaces articulating with upper extremity 
of the tibia, or leg-bone. 
The articular surfaces of both condyles are covered with cartilage, and 
united anteriorly to the prominences before mentioned, where they form 
a pulley-like surface, concave from side to side, over 
which the patella glides. Inferiorly, from before 
backwards, these prominences converge together, and 
terminate abruptly on the postero-interior surface of 
the bone; thus leaving a space between them and 
this interval, which has been denominated the inter- 
condyloid fossa. 
THE PATELLA, STIFLE-BONE, OR KNEE-CAP, lies on the 
lower extremity of the femur, at the anterior part of 
the stifle-joint. Itis quadrangular in form; its anterior 
surface is convex and rough; its posterior being 
Fic. 34. — Posterior 
VIEW OF THE PATELLA, 
1. Superior angle. 
2. 3. Surfaces gliding cn 
the trochlee of 
the femur. 
covered with cartilage is smooth, and is divided by an eminence running 
