BONES OF THE PELVIC LIMB 



203 



The femur is relatively much longer than in the horse or ox. The shaft is regu- 

 larly cylindrical, except near the extremities, where it is wider and compressed from 

 before backward. It is strongly curved in its distal two-thirds, convex in front 

 Ihe posterior surface is flattened transversely, narrow in the middle, and widens 

 toward each end. It is bounded by two rough lines (Labium laterale, mediale) 

 which diverge toward the extremities. The third trochanter and the supracondyloid 

 tossa are absent. There are two supracondyloid crests, the medial one being small 

 ihe nutrient foramen is m the proximal third of the posterior surface. The head 

 is a httle more than a hemisphere and has a shallow fovea behind and lateral to its 

 center. The neck is well defined. The trochanter major does not extend as high 



Crest of ilium 



Wing of ilium 



Tuber coxw 



Shaft of ilium 



Ilio-pectineal 

 eminence 



Acetabular branch of 

 pubis 



Symphyseal branch of 

 pubis 

 Symphyseal branch of 

 ischium 



Vascular impression 



- Sacro-iliac articulation 



Nutrient foramen 

 Ilio-pectineal line 



Tubercle 

 Acetabulum 



Obturator foramen 



Acetabular branch of 

 ischium 



Tuber ischii 



Ischial arch 



Fig. 223. — Pelvic Bones of Dog; Ventral ^'iew. 

 1, Body of first sacral vertebra; 2, wing of sacrum; 3, sacral canal; 4, median crest of sacrum; 5, pelvic surface of 



as the head ; a thick ridge runs from its anterior surface to the neck. The trochanter 

 minor has the form of a blunt tuberosity. The trochanteric fossa is round and 

 deep. The ridges of the trochlea are practically sagittal in direction and are al- 

 most similar. The intercondyloid fossa is wide. Just above each condyle pos- 

 teriorly there is a facet for articulation with the sesamoid bone which is developed 

 in the origin of the gastrocnemius muscle. Union of shaft and extremities takes 

 place at about one and a half years. 



The tibia is about the same length as the femur. The shaft forms a double 

 curve; the proximal part is convex medially, the distal part laterally. The prox- 

 imal third is prismatic, but is compressed laterally and is long from before backward. 

 The remainder is almost regularly cylindrical. The crest is short but very prom- 



