Nasal Fossa 119 



The lymphatics end in the glands beneath the jaw. The nerves come 

 from the chorda tympani (p. 66) and from the branches of the sub- 

 maxillary ganglion. 



The sublingual gland lies in a slight depression behind the jaw, 

 near the symphysis, and along the anterior border of the genio-hyo- 

 glossus. It is at the side of the fraenum, and, resting upon the mylo-hyoid, 

 is covered only by mucous membrane. The hinder part is in relation 

 with that piece of the submaxillary gland \vhich is tucked beneath .the 

 mylo-hyoid. The ducts (Rivinian\ a dozen or more, open separately 

 by the side of the frsenum, but some join Wharton's duct as it runs 

 between the sublingual gland and the genio-hyo-glossus. 



Supply. Its arteries come from the sublingual and submental ; 

 the lymphatics pass to the submaxillary glands ; the nerves come from 

 the gustatory. 



THE NOSE 



T\& foundation of the nose is made of the nasal processes of the 

 superior maxillae, the nasal bones, the nasal spine of frontal, and the 

 vertical part of the ethmoid. But, with the view of obviating fracture, 

 the rest of the organ is composed of small cartilaginous plates which 

 are connected with each other, with the adjacent bones, and with the 

 cartilage of the septum by fibrous tissue, as well as by skin and 

 mucous membrane. These small cartilages can be acted on by 

 muscles which raise, depress, dilate, or compress the nares under the 

 guidance of the facial nerve. 



Supply. The arteries come from the lateral nasal of the facial, 

 and from the superior coronary the artery of the septum. The root 

 of the nose also obtains blood from the nasal branch of the ophthalmic 

 and from the infra-orbital of the superior maxillary. The veins enter 

 the facial and the ophthalmic. The lymphatics pass to glands behind 

 the ramus of the jaw. The nerves are branches of the facial (for the 

 muscles), of the infra-orbital, of the nasal, and the infra-trochlear. 



The nasal fossa opens in front by the nostrils, and into the pharynx 

 by the posterior nares. The floor is formed by the superior maxilla 

 and palate bones, and the roof by the nasal and frontal bones, the 

 cribriform plate of the ethmoid bone, and the body of the sphenoid. 



Syphilitic inflammation of the muco-periosteum of the nose in 

 childhood is apt to cause necrosis of the nasal bones, involving a 

 permanently sunken bridge. 



As a result of imperfect ossification in the region of the anterior 

 and median part of the frontal bone, the membranes of the brain may 

 bulge forward and produce a mening-ocele. This defect is most often 

 found at the root of the nose, but on rare occasions the protrusion has 

 escaped by the cribriform plate of the ethmoid, and, having been 



