A MANUAL OF ANATOMY 



dental canal, (2) the basilar border and angle, and (3) the ramus as high as 

 the interior dental foramen. The mesial part of Meckel's cartilage is invaded 

 by osseous extension from the primordial membrane-bone formed from the 

 single centre, the mesial part of Meckel's cartilage becoming incorporated 

 with the bone so formed, and constituting the incisor portion of the mandible. 



AT BIRTH 



Fig. 75. — The Inferior Maxillary Bone at Different Periods of Life. 



The accessory cartilages, which are distinct from Meckel's cartilage, are as 

 follows: (i) Condylar, (2) coronoid, and (3) symphysial. All these accessory 

 cartilages become surrounded and invaded by osseous extension from the 

 primordial membrane-bone formed from the single centre, and they become 

 incorporated with the parts of the mandible so formed. 



The condylar cartilage gives rise to (i) the condyle, and (2) the posterior 



