72 



THE BONES. 



E Rabbit.-Proportion..tely long and wide, the uasal bone of the RabbU articulates by 

 the whole of its external border, with the ascending process of the premaxillury bone. The 

 anterior extremity of the nasal bone is very slightly salient. 



Fig. 41. 



LONGITUDINAL AND TRANSVERSE SECTION OP 

 THE horse's head, SHOWING THE FLOOR OF 

 THE CRANIAL AND NASAL CAVITIES, WITH 

 THE MAXILLARY SINUSES. 



1, Condyloid foramen. 2, Section of the parieto 

 temporal canal. 3, Foramen lacerum basis 

 cranii. 4, Carotid notch. 4', Maxillary 

 notch: a, supermaxillary fissure ; 6, cavern- 

 ous fissure. 5, Origin of the supra-sphe- 

 noidal canals : c, sella Turcica. 6, Optic 

 fossa. 7, Portion of the crista-galli process. 



8, Cribriform plate of the ethmoid bone. 



9, Perpendicular plate of the i^ame bone. 



10, 10, Its lateral masses. 11, Interior of 

 the great ethmoidal cell. 12, 12, Bottom of 

 the maxillary sinuses communicating with 

 the sphenoidal sinuses. 13, Superior 

 maxillary sinus. 14,Inferior maxillary sinus. 

 14', Superior compartment of the maxillary 

 turbinated bone, forming part of the latter 

 sinus. 15, Section of the supermaxillo- 

 dental canal. 16, Channel of the vomer. 

 17, Internal process, or point of the pre- 

 maxillary bone. 



ANTERO- POSTERIOR AND VERTICAL 

 SECTION OF THE HORSE'S HEAD. 



1, Condyloid foramen ; 2, parietal 

 protulierance ; 3, internal audi- 

 tory hiatus ; 4, cerebral cavity ; 

 5, cerebellar cavity ; 6, supe- 

 rior border of the perpendicular 

 plate of the ethmoid bone (crista- 

 galli process) ; 7, ethmoidal 

 volutes — nasal face ; 8, vestiges 

 of the right frontal sinus; 9, 

 ditto of the sphenoidal sinus ; 

 10, ptervgoid process; 11, eth- 

 moidal turbinated bone ; 12, 

 maxillary turbinated bone ; 13, 

 crest of the supermaxillary 

 bone to which the latter is 

 fixed ; 14, vomer. A, Orifice of 

 communication between the 

 nasal cavity and the sinus. 



