HEAD AND NECK OF THE HORSE 



75 



at the slit-like pharyngeal ostium (ostium tuky pharyngeum), which 

 has been examined in association with the cavity of the pharynx. The 

 cartilage is nowhere tubular in form, but should be regarded rather as a 



Superior longitudinal sinus. 



Lateral ventricle. 



Cerebral hemisphere. 



M. temporalis. 

 Cavernous sinus. 



Mandibular 

 joint. ^ 



N. massetericus. 



M. pterygoideus 



externus. 



Mm. tensor et 



levator veli 



palatini. 



Eustachian tube. 



M. masseter. . 

 Diverticulum of 

 Eustachian tube. 

 M. stylo- 

 |i pharyngeus.- 



;|M. pterygoideus 

 internus.' 



Pharynx. -^ 



Aryepiglottic 

 fold. 



V[. stylohyoideus. g, 



M. digastricus. 



Pharyngo- 



palatine arch. 



M. thyreo- 

 hyoideus. 



Fornix. 



Third ventricle. 

 Optic tract. 



Hypophysis. 



■■ A. carotis interna. 



III., IV., VI., &c.^ 



N. canalis 

 pterygoidei. 



,N. buccinatorius. 



A. maxillaris 

 _ interna. 



A. transversa 

 — faciei. 

 Nn. alveolaris in- 

 ferior et lingualis. 

 N. facialis. 



V. maxillaris 



interna. 

 — A. buccinatoria. 

 Hvoid bone. 



N. glosso- 

 pharyngeus. 



A. maxillaris 

 externa. 



N. hypoglossus. 



A. masseterica. 



Submaxillary gland.'' _ _ _ „ _ 



"Thyroid cartilage. 



Cuneiform cartilage.^ / \ ^^- . , , 



•\ Parotid duct. 



Mm. sternohyoideus et omohyoideus. V. maxillaris externa. 



Fig. 25. — Transverse section of the head at the level indicated 

 by C in Fi,^. 1 (looking backward). 



* [III., IV., VI., &c.= oculomotor, trochlear, abducent, ophtlialniic and maxillary nerves.] 



relatively narrow strip, increasing in width from the temporal to the 

 pharj^ngeal end, and folded upon itself longitudinally so that medial and 

 lateral laminas, united dorsally, are produced. The lateral lamina is 

 narrow throughout, and is covered by the tensor and levator muscles of 



