The Skull as a Whole. 139 



and posterior series of brbader folds, which together constitute the 

 ethmoturbinal. In the rabbit, as in mammals generally, the 

 latter is, divisible into a more dorsal elongated portion' attached 

 to the nasal bone, the nasoturbinal, and a more ventral portion, 

 also posterior portion, the ethmoturbinal proper, composed of 

 several shorter folds decreasing in length from above downward. 

 In the natural condition the turbinated bones bear a considerable 

 portion of the nasal epithelium, the surface of which is greatly 

 increased by the folding of the underlying bone. That covering 

 the ethmoturbinal contains the olfactory sense organs, while that 

 covering the maxilloturbinal is non-sensory and possesses the 



Fig. 63. Lateral surface of the left half 'of the mandible: a;m. 

 angle; cm;, body of mandible; cp.m.^ articular portion (head) 

 of mandible; d.i., d.m., and d.-pm., incisor, molar and premolar 

 t'eeth; f.m., mental foramen; i.m.a. and i.m.p., anterior and 

 posterior mandibular incisures; p.c, coronoid process; p.cd.. 

 condyloid process; t.m. and t.pt., masseteric and pterygoid 

 tuberosities. 



mechanical function of freeing the air of the respiratory tracts from 

 foreign materials, as well as of warming it slightly in its passage. 

 On this account the respective structures are conveniently distin- 

 guished as sensory (olfactory) turbinals and respiratory 

 turbinals. 



The mandible (mandibula) is composed of two portions, united 

 anteriorly by the symphysis mandibulae. Each half comprises 

 a horizontal portion, forming in conjunction with that of the oppo- 

 site side the body of the mandible (corpus mandibulae), and a 

 po'sterior, vertical portion, the ramus mandibulae, the latter 

 serving for the insertion of the muscles of mastication and for 

 articulation with the skull. The body of the mandible bears on its 



