HEAD AND NECK OF THE HORSE 



141 



Tlie tentor'iiiin ^ eerebelli is interposed between the cerebellum and 

 the hemispheres of the cerebrum. Its central portion is attached to the 

 latei'al margins of the osseous tentorium, while its lateral parts are 

 adherent to the projecting ridge produced by the border of the temporal 

 bone. The free ventral edge of the fold is concave and thin, and bounds 

 an opening (incisura tevtor'ri), triangular in outline, by which the 



Falx cerebri. 



Optic chiasma. 



N. oculomotorius, 

 Hypophysis, 



A. intercarotica, 



N. abducens. 



N. trigeminus, 



N. facialis, 



N. acusticus, 



N. glossopharyngeus. 

 N. vagus. 

 N. accessorius. 



Olfactory bulb. 



A. meningea anterior. 



A. cerebri anterior. 

 A. cerebri media. 



A. communicans 



posterior. 

 N. oculomotorius. 

 N. trochlearis. 

 N. abducens. 

 Ganglion semilunare. 



N. hypoglossus. 



Fig. 60. — The floor of the cranial cavity. On the right side the dura mater 



has been removed. 



middle and posterior cranial fossae communicate with each other. The 



opening is occupied by the mid-brain. 



The diaphragma sella'- is a circular thickening of the dura mater 



that surrounds and in a manner defines the sella turcica. A central 



opening in the fold acconmiodates the infundibulum. The diaphragm 



forms a resisting roof to the cavernous and intercavernous blood sinuses, 



and is applied to part of the upper surface of the hypophysis. It is 



1 Tentorium [L.], a tent (literally something stretched out). 



"^oidcppayfia (diaphragnux) [Gr.], a partition wall. Sella [L.], a seat (a saddle). 



