DISSECTION OF THE HEAD AND NECK. 219 



The Anterior Deep Temporal Artery passes forwards out of the 

 subsphenoidal canal by the temporal foramen above the edge of the 

 orbital hiatus. It is expended in the temporal muscle and the over- 

 lying skin. 



The Buccal Artery is detached shortly after the parent vessel 

 emerges from the bone. It has already been followed in its distribution 

 to the cheek. 



The Superior Dental Artery is a large branch which enters the 

 superior dental canal. The vessel is continued above the roots of 

 the molar, incisor, and canine teeth. Before passing into the canal, 

 it 'gives off an orbital branch which passes across the floor of the 

 orbit to reach the face. Within the canal it emits an infraorbital 

 branch which reaches the face by the infraorbital foramen. 



The Staphyline Artery is a slender branch given off from the 

 posterior aspect of the internal maxillary, close to the maxillary hiatus. 

 It courses along the staphyline groove to reach the soft palate. 



The Spheno-palatine (Nasal) Artery. This vessel is of consider- 

 able size, and passes at once through the spheno-palatine foramen 

 to be distributed in the nasal chamber. 



The Palato-labial Artery is the continuation of the internal maxil- 

 lary. It passes along the palatine canal to reach the hard palate. 



Veins. At this point the veins have a disposition slightly different 

 from the arteries. The alveolar vein — a large vessel lying on the 

 superior maxilla in front of the molar teeth — turns round the bone 

 and reaches the maxillary hiatus. Here it receives superior dental, 

 palatine, and spheno-palatine branches. It then perforates the ocular 

 sheath, within which it joins the ophthalmic vein. The ophthalmic 

 vein passes into the cranial cavity by the foramen lacerum orbitale, 

 and joins the cavernous sinus. 



The superior dental and spheno-palatine veins emerge by the same 

 foramina as the corresponding arteries. The palatine vein, however, 

 does not issue from the palatine canal, but turns round the bone 

 in the staphyline groove. 



The Superior Maxillary Division of the 5th Nerve. This sensory 

 division of the trifacial emerges from the cranium by the foramen 

 rotundum, as a large round cord. In company with the internal maxil- 

 lary artery, it descends to the maxillary hiatus, w r here it enters the 

 superior dental canal. Within the canal it gives dental branches to the 

 roots of the molar, canine, and incisor teeth, and then issues on the face 

 at the infraorbital foramen. In its passage between the orbital and the 

 maxillary hiatus, it gives off the following branches : — 



1. An Orbital Branch. — See page 217. 



2. The Palatine Nerve accompanies the palato-labial artery into the 

 palatine canal, and is distributed to the hard palate. 



