Arthrology. 37 



The scaphoid is boat-shaped, articulating with four ; the astra- 

 galus above, cu7ieifo7-tns below, and the cuboid externally. 



The great cu?ieiform (wedge-shaped), lies inside the cuboid, 

 articulating with it, the small cuneiform, scaphoid, juiddle and 

 internal metatarsals. 



The small cuneiform lies on the inner side of the tarsus, articu- 

 lating with the scaphoid, large cuneiform, middle and internal 

 metatarsals. 



THE METATARSUS. 



The median is longer and larger than that in the anterior ex- 

 tremity. The external is longer and thicker than the interfialy 

 which has two facets above for the tarsus. 



THE DIGITAL REGION. 



The first phalanx is shorter, the second narrower, the third 

 narrower, more V-shaped, the sesamoid smaller, and the navicu- 

 lar shorter and narrower than the corresponding bones of the 

 anterior foot. 



ARTHROLOGY. 



The articulations are divided into three classes : 



1. Synarthroses or immovable joints. 



2. Amphia?'th7'oses or limited in motion. 



3. DiartJu'oses, freely movable joints. 



Synarthroses are further divided into — 



(^) Schindylesis, a bony plate received into a groove. 



(^) Gomphosis, a conical process in a socket. 



{c) Sutura or by indentation, which are again divided into 

 sntura vera and sutura notha. 



{d) Sutura vera, true sutures. 



Sutura dentata, tooth-like processes. 



S. serrata wath saw-like processes. 



S. limhosa with beveled margins and dentated processes. 



(d-) Sutura 7iotha, false sutures. 



S. harmonia by opposed rough surfaces. 



6". squajnosa with overlapping bony tables. 



Diarthroses are divided again into — 

 Arthrodial, or gliding joints. 



