20 



ANATOMY OF THE RABBIT 



This bone develops from four parts, the names of which are 

 retained for descriptive purposes after the parts have fused 

 to form a single bone. The basioccipital forms the floor of 

 the foramen magnum, the supraoccipital the roof and the two 

 exoccipitals the two sides of this foramen. 



The two parietal bones form most of the vault of the 

 cranium. These bones articulate with each other, with the 



Fig. 2. — Skull, caudolateral view. C, condyle of occipital bone (occipital 

 condyle); EA, external auditory meatus, osseous portion; F, frontal; G, pie- 

 molars and molars; I, interparietal; IF, infraorbital foramen; IN, incisors; L, 

 lachrymal bone; M, malar bone; MP, mastoid process of temporal; MX, maxil- 

 lary; N, nasal; NP, nasal process of premaxillary; PM, premaxillary ; SE, 

 styloid process of exoccipital; SF, stylomastoid foramen; SO, supraoccipital; 

 SP. squamous portion of temporal; TP, tympanic bulla. 



interparietal caudad, the temporals laterad and the frontals 

 craniad. 



The two temporal bones form the major portion of the 

 sides of the cranium, contain the auditory organs, furnish 

 attachment for muscles and contribute to the structure of the 

 zygomatic arches. The temporal bone (temporal complex) 

 is made up of three (4, Bensley, 5 in man, Gray) portions 

 (squamous, tympanic, and petrous), which are fused together 

 in well ossified skulls. These portions of the temporal are 



