182 



SKELETON OF THE PIG 



about three and a half to four inches (ca. 8.75 to 10 cm.). In the female the floor 

 is relatively wide and flattened, especially at the outlet, where the tubera are 

 everted; it also has a decided ventral inclination behind. The pelvic axis is there- 

 fore correspondingly oblique. The ischial arch is wide. In the boar the pubis is 

 much thicker and the ischia are not everted posteriorlj\ The inlet is smaller; the 

 conjugate diameter is about four and a half to five inches (ca. 11-12.5 cm.), and the 

 transverse three to three and a half inches (ca. 7.5-8.75 cm.). The floor is concave 

 from side to side and slopes decidedly less than in the sow. The superior ischiatic 

 spines are more incurved, and the ischial arch is much narrower and deeper. 



The femur has a relatively wide and massive shaft, on which four surfaces 

 might be recognized. The principal nutrient foramen is situated in the proximal 



Lateral condyle 



Spine of tibia Tuberosity 



.^-^< 



Head of 

 fibula 



Shaft of 

 fibula 

 Interosseous 

 space 



Groove for 

 tendons 



Lateral 

 malleolus 



Medial 

 condyle 



Medial condyle Spine of tibia 



Lateral condyle 



Head of 

 fibula 



Crest of tibia 



Medial 

 malleolus 



Shaft of 

 fibula 



Interosseous 

 space 



Lateral 

 malleolus 



Fig. 195. — Right Tibia and Fibula of Pig; Ante- 



EioE View. 



Arrow indicates muscular notch of proximal end of 



tibia. 



Distal end of tibia 



Fig. 196. — Right Tibia and Fibula of Pig; Pos- 

 terior View. 

 a, Groove on medial malleolus for tendon of flexor dig- 

 italis longus. 



third of the anterior surface. The posterior surface is wide, and is limited laterally 

 by a ridge which extends from the trochanter major to the large lateral supra- 

 condyloid crest. There is no supracondyloid fossa. The head is strongly curved, 

 and is marked toward the medial side by a rather large fovea for the attachment of 

 the round ligament. The neck is distinct. The trochanter major, although massive, 

 does not extend above the level of the head. The trochanteric ridge and fossa re- 

 semble those of the ox. The third trochanter is absent. The ridges of the trochlea 

 are similar and almost sagittal. The extremities unite with the shaft at about 

 three and a half years. 



The shaft of the tibia is slightly curved, convex medially. The tuberosity 

 is grooved in front, and a narrow sulcus separates it from the lateral condyle. 

 The facet for the fibula is on the posterior border of the latter, and is bounded 



