i ila Th! 2) dei ell 
NASAL FOSS. 677 
Continuous with its postero-superior 
angle are two or three small carti- 
laginous pieces (cartilagines alares 
minores), while sometimes a horizon- 
tal furrow cuts off a narrow linear 
part from its upper aspect. The 
lower edge of the outer plate does 
not reach down as far as the lateral Nasal bone— 
boundary of the nostril, the ala being 
devoid of cartilage and composed Nasal process of __ 
merely of fatty and connective “?™"™™™" 
tissue- covered by skin. The inner Upper lateral 
plate, or crus mediale (Fig. 487), Hy ea 
bounds the inner aspect of the nostril 
and lies in the septum mobile nasi, ,,\., 
below the anterior part of the carti- lateral j#@—_ 
lage of the septum. The mesial “"""* ( 
plates of the two cartilages are separ- 
ated in front by a notch, which 
corresponds with the point of the 
nose, and each curves slightly out- 
wards posteriorly and ends in a 
rounded extremity. 
Cartilagines 
“‘minores 
\ Fatty 
‘ tissue 
\ “of ala 
\ nasi 
NASAL FOSS. ( 
The nasal fosse (Fig. 488) are 
two in number and are placed one on Sy (Al a 1} gee 
erehaidevof theemiddiaines | Mheyy ts St.5 gern ce eaaeoee, MUM 
extend from the anterior to the 
posterior nares or choane, and open through the latter into the naso-pharynx. 
dhe bony boundaries are described in the section on Osteology (p. 158). On 
= ~ the lateral wall of each are found 
the orifices of the frontal, eth- 
moidal, sphenoidal, and maxillary 
sinuses, together with that of the 
nasal duct. 
Immediately above the aperture 
of the nostril is a slightly ex- 
Nasal process of Panded area, the vestibule (vesti- 
superior maxilla bulum nasi). This is bounded 
externally by the lower lateral 
cartilage, and, internally, by the 
_Upper lateral lower part of the septum, and is 
~Nasal bone 
cartilage 
dG aoinee of prolonged towards the tip of the 
septum nose as a small pouch, termed the 
Goan ventricle. Partly subdivided by a 
cartilage 
Lower lateral curved ridge, the vestibule is lined 
Gules by skin and contains hairs and 
—Crus laterale 
ey sebaceous glands. The hairs, or 
vibrisse, springing from its lower 
half, are stout and curved down- 
wards to guard the entrance to the 
nostril. The upper part of the 
vestibule is smooth and is limited 
above and behind by a slightly- 
marked arched prominence, the 
ee a tlbnincee Vike OF Gum BONY Ano Canteens men! masi, beyond which the fossa 
SKELETON OF THE NOSE. is lined by mucous membrane. 
“a 
— Crus mediale 
