BONES OF THE PELVIC LIMB 205 
The tarsus comprises seven bones. The tibial tarsal consists of a body, neck, 
and head, like the bone in man. The body presents a proximal trochlea for articula- 
tion with the tibia and fibula. The plantar surface has three facets for articulation 
with the fibular tarsal bone. The head is directed a little inward and articulates 
with the central. The fibular tarsal has a long anterior process or “beak,” but 
the sustentaculum is short. The tuber calcis presents a sagittal groove. The 
central has a concave proximal surface adapted to the head of the tibial tarsal. 
Its distal surface articulates with the first, second, and third tarsals. It bears two 
plantar tubercles. The first tarsal is flattened and irregularly quadrangular; its 
proximal surface articulates with the central and the distal with the first metatarsal. 
Spine 
Tuberosity Medial _ i. ———.— Lateral 
Sulcus muscu- condyle —4 = condyle 
laris Medial con- Pe 4 ~ 
dyle ha 4— Head of fibula 
/ 
Head of fibula 
Crest of tibta 
Interosseous 
space 
Shaft of fibula Shaft of tibia 
Interosseous space 
Shaft of tibia 
Lateral Medial Medial Lateral malleolus 
malleolus malleolus malleolus 
Fic. 226.—Ricur Trera anp Frsvta oF Doc; ANTE- Fic. 227.—Ricut Trsia anp Frstia oF Doc; Poste- 
RIOR VIEW. RIOR VIEW. 
The second tarsal is the smallest and is wedge-shaped; it articulates distally with 
the second metatarsal bone. The third tarsal is also wedge-shaped, the base being 
in front; it articulates with the third metatarsal distally. The fourth tarsal is 
remarkably high, and resembles a quadrangular prism; its proximal surface 
articulates with the fibular tarsal, its distal with the fourth and fifth metatarsal, 
and the medial with the central and third tarsal bones. A groove for the tendon of 
the peroneus longus crosses its lateral and plantar surface, and above it are one or 
two tubercles. The tuber calcis fuses with the body of the bone at fourteen or 
fifteen months. 
Five metatarsal bones are present. The first is commonly very small and has 
the form of a blunt cone, somewhat compressed laterally. It articulates with the 
