SOCIETY OF THE UNIVERSITY OF ABERDEEN. 



69 



is well seen here the inferior dental nerve is above the cartilage, the 

 lingual nerve passes down on its inner side, and the rnylo-hyoid 

 nerve passes between the bone and the cartilage. 



In a /n't//* (i() nun. lit length the relations of Meckel's cartilage 



Fig. 8. Coronal sections of the right half of the lower jaw of a human fetus, 43 nun. in length 

 (x 34). I. is between the central and lateral incisor tooth germs; II. through the lateral 

 incisor tooth germ; III. at the mental foramen; IV. through middle of b.>dy of jaw ; V. 

 through posterior part of body ; VI. through the coronoid process. J., lower jaw, a continuous 

 sheet of membrane bone; D., dental lamina; N., inferior dental nerve; M.C., Meckel's 

 cartilage. (From the Proceed, of the Anaiom. Sac. of Great Britain ami Ire/miJ, 1905, p. 27.) 



are similar to those obtaining in the last specimen, but the cartilage 

 is undergoing resorption and ossification in the region between the 

 lateral incisor and canine tooth germs marrow cavities being formed 

 by ingrowing tissue with osteoclasts and new bone formed by osteo- 



