182 SKELETON OF THE PIG 
about three and a half to four inches (ca. 8.75 to 10 em.). 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 posteriorly. The inlet is smaller; the 
conjugate diameter is about four and a half to five inches (ca. 11-12.5 em.), and the 
transverse three to three and a half inches (ca. 7.5-8.75 em.). The floor is concave 
from side to side and slopes decidedly less than in the sow. The superior ischiatie 
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 
Spine of tibia Tuberosity Medial condyle Spine of tibia 
Lateral condyle AL Medial Lateral condyle 
ra ea ; condyle 
Head of Head of 
fibula fibula 
7 Crest of tibia 
Shaft of 
fibula 
Interosseous Shaft of 
Space Sibula 
Interosseous 
space 
Groove for @ 
tendons 
Lateral Medial Lateral 
malleolus 
malleolus 
malleolus a 
Distal ena of tibia 
Fic. 195.—Ricutr Trista anp Frsuta or Pic; ANTE- Fic. 196.—Ricur Tipra anp Fisuxta oF Pia; Pos- 
RIOR VIEW. TERIOR VIEW. 
Arrow indicates muscular notch of proximal end of a, Groove on medial malleolus for tendon of flexor dig- 
tibia. 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. ‘Phere 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 
