REGIONAL ANATOMY 7 
A. THE BONES. 
THE SEconp Puatanx, Os Coron, orn Smaxy PastEern 
Bonrt.—This belongs to the class of small bones, in that it 
possesses no medullary canal. It is situated obliquely in 
the digit, running from above downwards and from behind 
Fic. 1.—TsE Bones oF THE PHALANX. 
1, The os suffraginis ; 2, the os corone ; 3, the os pedis; 4, the navicular 
bone, hidden by the wing of the os pedis, is in articulation in the position 
indicated by tlhe barbed line. 
to before, and articulating superiorly with the first phalanx 
or os suffraginis, and inferiorly with the third phalanx and 
the navicular bone. 
Cubical in shape, it is flattened from before to behind, 
and may be described as possessing six surfaces: An 
