'A MANUAL OF ANATOMY 



The Semilunar Bone. 



The semilunar or lunar bone is characterized by the crescentic 

 concavity on its inferior surface. Superiorly it presents a quadri- 

 lateral, convex, articular surface for the radius, which encroaches 

 on the dorsal aspect. The inferior surface is deeply concave from 

 before backwards. The greater part of it articulates with the upper 

 surface of the head of the os magnum, and the narrow inner strip 

 with the upper border of the unciform. The external surface, 



Internal Surface for Cuneiform 

 For Unciform (on^ 

 Inferior Surface) ^y 

 Palmar Surface 



Dorsal Surface 



B 



Superior Surface for Radius 



Palmar Surface 



Inferior Surface for Os Magnum For Scaphoid (on External Surface) 



Fig. 114. — The Right Semilunar Bone. 

 A, Internal View ; B, Supero-external View. 



narrow from above downwards, presents a crescentic facet for the 

 scaphoid. The internal surface, which is inclined downwards 

 and outwards, is deep from above downwards, and presents 

 a, semi-oval facet for the cuneiform. The palmar and dorsal 

 surfaces are rough, the former being large, convex, and quadri- 

 lateral, and the latter small and flat. 



Articulations. — Superiorly v/ith the radius, inferiorly with the os 

 magnum and unciform, externally with the scaphoid, and internally 

 with the cuneiform. 



The Cuneiform Bone. 



The cuneiform or pyramidal bone is characterized by its resem- 

 blance to a wedge, or pyramid, and it lies obliquely with the base 



^Inferior Surface for Unciform 



-External Surface for Semilunar 



For Pisiform 

 (on Anterior Surface) 



Anterior Surface 



• Fig. 115. — The Right Cuneiform or Pyramidal Bone 

 (Anterior, External, and Inferior Surfaces). 



directed outwards and upwards. The external surface, which 

 corresponds with the base, presents a semi-oval facet for the semi- 



