52 



TABLE OF DEVELOPMENTS, ARTICULATIONS, ETC. 





Articulations. With the glenoid fossae of the two temporal bones, 

 through the medium of a fibro-cartilage. 



Attachment of Muscles. To fourteen pairs ; by the external surface 

 commencing at the symphysis, and proceeding outwards, levator 

 labii inferioris, depressor labii inferioris, depressor anguli oris, pla- 

 tysma myoides, buccinator, and masseter ; by the internal surface also 

 commencing at the symphysis, the genio-hyo-glossus, genio-hyoideus, 

 mylo-hyoideus, digastricus, superior constrictor, temporal, external 

 pterygoid, and internal pterygoid. 



Table shewing the Points of Development, Articulations, and Attach- 

 ment of Muscles, of the Bones of the Head. 



Attachment of 



The bones of the cranium and face are connected with each other by 

 means of sutures (sutura, a seam), of which there are four principal 

 varieties, serrated, squamous, harmonia, and schindylesis. 



The serrated suture is formed by the union of two borders possessing 

 serrated edges, as in the coronal, sagittal, and lambdoid sutures. In 

 these sutures the serrations are formed almost wholly by the external 

 table, the edges of the internal table lying merely in apposition. 



The squamous suture (squama, a scale) is formed by the overlapping 

 of the bevelled edges of two contiguous bones, as in the articulation 

 between the temporal and lower border of the parietal. In this suture 

 the approximated surfaces are roughened, so as to adhere mechanically 

 with each other. 



The harmonia suture (cigtTv, to adapt) is the simple apposition of 

 contiguous surfaces, the surfaces being more or less rough and reten- 

 tive. This suture is seen in the connection between the superior 

 maxillary bones, or of the palate processes of the palate bones with 

 each other. 



