186 



ANATOMICAL TECHSOLOQT. 



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. 



Pig. 59. — Hbmisection of the SKtrLL, Right Side; xl.5. 



Bulla tyra., 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 tlie condylar foramen is an un- 

 named opening for a vein. 



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



Fm. sphplt., Foramen spheno-palatinum.— Sphenopalatine foramen. 



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



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

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

 the cerebellum and medulla (Fig. 88). 



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

 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 fossse. 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 (Pig. 57). 

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

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



