186 



ANATOMICAL TECHNOLOGY. 



to the left of the meson to avoid injuring the mesethmoideum and 

 other mesal parts. The remaining parts of the left half were after- 

 ward removed with the nippers ; the septa of the frontal and sphe- 

 noidal sinuses were likewise partly removed. 



Fig. 59. — Hemisection of the Skull, Eight Side ; x 1.5. 



Bulla tym., Bulla tympanica. — Tympanic or auditory bulla (Fig. 58). 



Fm. j., Foramen jugulare— s. Fm. lacerum posterius. — Jugular or posterior lacer- 

 ated foramen. 



Opposite the occipital condyle and nearly caudad of tbe condylar foramen is an un- 

 named openings for a vein. 



Fm. op., Foramen opticum. — Optic foramen. 



Fm. sphplt., Foramen spheno-palatinum. — Spheno-palatine foramen. 



Fs. ap., Fossa appendicularis (Fig. 56). 



§ 547. Fossae of the Cranial Cavity.— (A) Fossa cerebellaris, az.— Cerebellar 

 fossa. — THs is the part of the cranial cavity caudad of the osseous tentorium. It contains 

 the cerebellum and medulla (Fig. 88). 



(B) Fossa cerebralis, as.— Cerebral fossa.— This is the part of the cavity of the stull 

 between the tentorium caudad and the olfactory fossa cephalad. It contains the cere- 

 brum, thalamus, part of the optic lobes and the crura (Fig. 88). 



(C) Fossa olfactoria — s. rhinencephalica — Olfactory or rhinencephalic fossa. — This 

 is the smallest of the fossae. It is limited cephalad by the Lamina cribrosa and extends 

 caudad to the dorso-ventral ridge formed by the frontal and orbito-sphenoid. It lodges 

 the rhinencephalon or olfactory lobes (Fig. 88). 



M. a. i., Meatus auditorius internus. — Internal auditory meatus (Fig. 57). 

 O. exoc, Os exoccipitale. — Exoccipital bone (Fig. 56). 

 O. soc, Os supraoccipitale, az. — Supraoccipital bone. 



