ARTHROLOGY. 37 



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

 alus above, cuneiforms below, and the cuboid externally. 



The great cuneiform (wedge-shaped), lies inside the cuboid, 

 articulating with it, the small cuneiform, scaphoid, middle 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 internal 

 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. Amphiarthroses or limited in motion. 



3. Diarthroses, freely movable joints. 



Synarthroses are further divided into 



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



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



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

 sutura vera and sutura notha. 



(d) Sutura vera, true sutures. 

 Sutura dentata, tooth-like processes. 

 S. serrata with saw-like processes. 



S. limbosa with beveled margins and dentated processes. 



(e) Sutura notha, false sutures. 



S. harmonia by opposed rough surfaces. 

 S. squamosa with overlapping bony tables. 



Diarthroses are divided again into 

 Arthrodial, or gliding joints. 



