1-2 PROCEEDINGS OF THE ANATOMICAL AND ANTHROPOLOGICAL 



cation in section its position is still indicated by clusters of cartilage 

 cells and proliferating marrow tissue (Fig. 11). The condylar car- 



Fig. 11. 



Fig. 12. 



Fics 11 and 12 Coronal sections of the right half of the lower jaw of a human foetus, 80 mm. in 

 length ( x 15). Fig. 11 is a section anterior to the lateral incisor tooth germ, And shows the 

 remains of Meckel's cartilage (M.C.) surrounded by membrane bone. Fig. 12 is through the 

 canine tooth (D. 3), and shows Meckel's cartilage passing into the lower jaw. 



tilage is well-developed, and a strip of cartilage has just begun to 

 appear, in connection with the coronoid process. 



in a foetus 95 mm. in /<// ;////, the appearances are much the same 

 except that the coronoid cartilage is more largely developed. Car- 

 tilaginous remains of Meckel's cartilage are still to be denned in 

 the anterior part of the jaw. In this specimen both condylar and 



coronoid cartilages are present (Fig. 13). 

 On sagittal section the position of the 

 coronoid cartilage is well seen. The tip 

 of the process is cartilaginous, and from 

 this a band of cartilage extends along the 

 anterior border of the process to terminate 

 in a tapering point, just behind and below 

 the last milk molar tooth germ. Ossifica- 

 tion is passing into the cartilage from the 

 membrane bone behind. In the same pre- 

 paration the disposition of the wedge- 

 shaped condylar cartilage is also seen. 



< omlylar cartilage in its anterior part is becoming resorbed, 

 marrow tissue and osteoblasts passing into it from the membrane bone. 



Fig. 13. Sagittal section of tin- 

 posterior part of the lower jaw 

 of a human fn-tus, H.i mm. in 

 length ( x 5J). Showing the re- 

 lation of the coronoid (Or.) and 

 condylar (Cy.) cartilages to the 

 membrane bone. T., temporal 

 muscle ; D. 4., last milk tn.ilur. 



