THE CUBOID 



165 



Superior calcaneo-cuboid ligaments 

 Inferior calcaneo-cuboid ligaments. 

 Internal annular. 

 External annular. 



External calcaneo-astragaloid. 

 Posterior calcaneo-astragaloid. 

 Superior calcaneo-scaphoid. 

 Inferior calcaneo-seaj )hoid. 



Blood-supply. — The calcaneum is a vascular bone, and derives its blood from 

 the posterior tibial, and the internal and external malleolar arteries. 



Ossification. — The primary nucleus for this bone is deposited in the sixth 

 month (jf embryonic life. In the tenth year a nucleus appears for the epiphysis at 

 the heel, and unites with the body of the bone at the sixteenth year. The inner 

 and outer tubercles are formed by the epiphysis. 



THE CUBOID 



This bone is situated on the outer side of the tarsus; its posterior surface 

 is reniform in shape and articular for the anterior face of the calcaneum. The 

 anterior surface is smaller, and divided by a low vertical ridge; the inner facet 

 is for the base of the fourth, the outer facet receives the base of the fifth metatarsal 

 l)one. The upper (dorsal) surface is rough and non-articular. The inferior 

 (})lantar) surface is divided by a prominent ridge, which limits a deep furrow 



FOR EXTERNAL CUNEIFORM 



FOR CALCANEUM 



GROOVE FOR TENDON OF TH 

 PERCNEUS L0N6US 



Fig. 172. — The Lkft Clbuid. (luuer view.) 



FOR FOURTH METATARSAl 



Fig. 173. — The Left Cuboid. (Inner view.) 



FOR EXTERNAL CUNEIFORM 

 FOR CALCANEUM 



FOR SCAPHOID (OCCASIONAL) 



GROOVE FOR TENDON OF THE PERONEUS LONGUS 



Fig. 174. — The Left Cuboid. (Inner view.) 



FOR EXTERNAL CUNEIFORM 

 FOR SCAPHO'O 



directed from without forwards and inwards. This, the peroneal groove, lodges 

 the tendon of the peroneus longiis. 



The corner of the ridge on the narrow outer (fibular) border of the bone is 

 usually faceted for a sesamoid bone frequently found in the tendon of the peroneus 

 longus. The margin of the ridge and the surface of bone behind it afford attach- 

 ment to the long and short plantar (calcaneo-cuboid) ligaments. The flexor brevis 

 Jialhicis muscle has a small attachment to this part of the cul^oid. 



