THE TARSUS 



193 



posterior], deeply concave from side to side, which articulates with a corresponding surface 

 on the calcaneus. Of the malleolar surfaces, the lateral is almost entirely occupied by a large 

 triangular facet, broad above, where it is continuous with the superior surface, concave from 

 above downward, for articulation with the lateral malleolus; on the medial malleolar surface 

 is a pyriform facet continuous with the superior surface, broad in front and narrow behind, 

 which articulates with the medial malleolus. Below this facet the medial surface is rough for 

 the attachment of the deep fibres of the deltoid (internal lateral) ligament of the ankle. The 



Fig. 229. — The Left Foot. (Plantar surface.) 



Postero-inferior surface of the 

 calcaneus 



Abductor digiti quinti 

 Abductor ossis metatarsi quinti 



Quadratus plants (lateral head) 



Flexor hallucis brevis 

 Abductor ossis metatarsi quinti 



Flexor brevis digiti quinti 



Adductor hallucis 

 Third plantar interosseous 



Second plantar interosseous 

 First plantar interosseous 



Flexor brevis digiti quinti 



Abductor digiti quinti 



Third plantar interosseous 



Second plantar interosseous 

 First plantar interosseous 



Flexor digitorum brevis 

 Flexor digitorum longus 



Abductor hallucis 

 Flexor digitorum brevis 



Quadratus plant* (medial head) 



Tibialis posterior 



Tibialis anterior 

 Peroneus longus 



Abductor hallucis 

 Flexor hallucis brevis 



(mediali portion) 

 Flexor hallucis brevis 



(lateral) portion) 

 Adductor hallucis 

 Transversus pedis 



Flexor hallucis longus 



superior surface and the two malleolar surfaces together constitute the trochlea. The poste- 

 rior surface is of small extent and marked by a groove which lodges the tendon of the flexor 

 hallucis longus. Bounding the groove on either side are two tubercles, of which the 

 lateral [processus posterior tali] is usually the more prominent, for attachment of the posterior 

 talo-fibular ligament of the ankle-joint; the medial tubercle gives attachrnent to the medial 

 talo-calcaneal ligament. Continuous with the anterior aspect of the body is the neck, a con- 

 13 



