164 



THE SKELETON 



of the iiexor accemtrim. The margin of the sustentaculum has attached to it a part 

 of the (leltcud liiraiuent. 



The anterior surface is a concave articular facet for the posterior surface ol the 

 culjoid. Its outer and superior angle is somewhat prominent. 



Fig. 170.— The Left Calcaneum. (Dorsal view.) 



INNER TUBEflCLE 



INTEROSSEOUS GROOVE 



FACET FOR ASTRAGALUS ON THE 

 SUSTENTACULUM TALI 



FOR ASTRAGALUS 



PERONEAL TUBERCLE 



Tlic posterior surface is roughly rounded; the loAver part gives attachment 

 to a {lad of fat; the middle part serves for the attachment of the tendo Adiillis. At 

 its U])i)er ])art it is smooth, and is in relation with a bursa. 



Articulations. — The calcaneum articulates with the cuboid, the astragalus, and 

 with the OS trigonum when it exists as a separate element. 



Fig. 171.— The Calcaneum at the Fifteenth Yeae, showing the Epiphysis. 



APPEARS AT THE TENTH, AND UNITES AT THE SIXTEENTH YEAR 



Muscles attached to the calcaneum : — 



Extensor brcvis digitorum. Aliductor ossis metatarsi quinti. 



Abductor hallucis. • Accessorius. 



Flexor brevis digitorum. Tendo Achillis. 



Abductor minimi digiti. Plantaris. 



And a slip from the tibialis posticus. 

 Ligaments : — 



Internal lateral of ankle. 

 External lateral of anklo. 



Anterior annular. 

 Calcaneo-astragaloid ( interosseous ) . 



