386 



THE ANATOMY 01 THE HORSE 



and two extremities. It Wtas formerly called the round-bone, froiij being in 

 the centre of the part called by butchers " the round." 



The body, although compressed, is nearly cylindrical towards its centre ; 

 anteriorly, the bone is convex and smooth ; posteriorly, flattened and 

 rough ; superiorly and inferiorly, it is expanded to meet the enlarged 

 extremities. 



The superior extremity is prolonged into a thiok, flattened neck, 



FiP. 33.— The Fe.mur, pautiallt detached from xnn Cotyloid Cavity. 



A. External view of posterior half of tlio os iii- 

 iiominatum. 



0. Rough surface for the attachment of muscles. 



b. Cotyloid rim. 



c. Tuberosity of the ischium. 



1. Cotyloid cavity. 



2. Depression in which the round ligiuiieiit 



(ligamentum teres) is fixed. 



3. Obturator hole. 



R. External view of the right femur. 



4. Head of the femur (round-bone). 



5. Trochanter major externus. 



(.1. Tubercle on the head of the femur. 

 V. Trochanter minor externus. 

 S. Fossa for muscular Insertion. 

 0. 0. Trochlear surfaces for articulation with the 

 patella (knee-cap). 

 ] 0. External condyle. 



articulating with ujtper extremity of 

 the tibia, or leg-bone. 



directed upwards and inwards, so as to form an obtuse angle with the 

 rihaft. At the point of union are two eminences (trochanters, rpoxoiv, to 

 run or roll) ; one on the outer, and the other on the inner side ; and it is 

 from between these that the neck arises. 



The trochanter major is prolonged from the postero-external margin of 

 the body, and nearly in a line with its axis : it is a large irregular projec- 

 tion, rising into a pyramidal eminence. I'osteriorly, at its base, it presents 



