66 



PROCEEDINGS OF THE ANATOMICAL AND ANTHROPOLOGICAL 



each half of the lower jaw is mapped out as one complete membrane 

 bone, and from its mesial aspect a dental shelf has commenced to 

 grow inwards so as to overhang Meckel's cartilage from the outer side. 



M.C 



,* ^ 



v : "' 



.-"....-..; ^- .-.*/>" ?. '. - :..' 



Wj." . . ' .-:.' ! ' - -. .. '' 



M.C. 



51. 



K:. 



Fig. 6. Coronal sections of the ri>;ht half of the lower jaw of a human foetus, 28 mm. in length 

 (x 38). I. shows the membrane b:>ne in front of Meckel's cartilage; II. is through the 

 enlarged anterior extremity of Meckel's cartilage; III. is a section in front of the mental 

 foramen; IV. is near the anterior margin of the mental foramen; V. near the posterior 

 margin of the mental foramen; VI. through middle of body of jaw; VII. and VIII. through 

 posterior p. irt of body ; IX. 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. 



Tim varying appearances presented by coronal sections at different 



arc represented in Fig. 6. 

 At this stage the shape and relations of Meckel's cartilage are 



