THE TALUS. 



257 



the dorsal surface of the sustentaculum tali of the calcaneus. Posteriorly the 

 body is provided with two tubercles, separated by a groove ; the lateral of these 

 (processus posterior tali) is usually the larger, and is occasionally a separate ossicle 

 (os trigonum). To it is attached the posterior talo-fibular ligament of the ankle- 

 joint. The groove, which winds obliquely from above downwards and medially 

 over the posterior surface of the bone, lodges the tendon of the flexor hallucis 

 longus muscle. 



The head, of oval form, is directed forwards and medially. Its anterior surface 



Abductor digit! quinti 

 (origin) 



Quadratus plantae 

 (origin) 



Long and short plantar ( 

 ligaments ( 



Tibialis posterior (part of 

 insertion) 



Peronseu.s brevis 

 (insertion) 



Flexor digiti qninti 

 brevis (origin) 



Oblique head of abductor 

 hallucis (origin) 



Flexor digitorum brevis. (origin) 

 Abductor hallucis (origin) 



Attachments of 

 plantar calcaneo- 

 navicular ligament 



Flexor hallucis brevis 

 (origin) 



Tibialis posterior (part 

 of insertion) 



Peronseus longus 

 (insertion) 



Tibialis anterior 

 (insertion) 



FIG. 256. MUSCLE-ATTACHMENTS TO LEFT TARSUS AND METATARSUS (Plantar Aspect). 



convex from side to side and from above downwards, and articulates with the 

 tavicular bone (facies articularis navicularis). Inferiorly this surface is confluent 

 yith the middle calcanean facet, but in well-marked specimens, or when the bones 

 are articulated, it will be seen that a small area in front of, and lateral to the 

 middle calcanean facet rests upon an articular surface on the dorsal surface of the 

 anterior portion of the calcaneus, and is called the anterior calcanean facet (facies 

 articularis calcanea anterior). On the medial and plantar surface of the head there is 

 a cartilage-covered surface which does not articulate with any bone, but rests on 

 the dorso-lateral surface of the plantar calcaneo-navicular ligament, and is sup- 

 ported on the medial side by the tendon of the tibialis posterior muscle. (Fawcett, 

 Ed. Med. Journ., 1895, p. 987.) 



