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Front 1

NOSE

PARTS

Back 1

I. Nose

A. Parts: the alae are the flared parts lateral to the nostrils, the dorsum is the
ridge between the tip ofthe nose and forehead, and the bridge ofthe nose is
where the dorsum meets tlie forehead

Front 2

NOSE

SKELETON: BONY COMPONENTS

Back 2

B. Skeleton

1. Bony components: tlie nasal part ofthe frontal bone, the nasal bones,
and the portions of the maxillae bordering the piriform aperture pro-
vide a firm foundation for tlie cartilaginous components ofthe nose

Front 3

NOSE

SKELETON: CARTILAGINOUS COMPONENTS
-lateral process of the septal cartilage

Back 3

B. Skeleton

2. Cartilaginous components

a. Lateral process of the septal cartilage: triangular plate supporting
the side ofthe nose; articulates superiorly with the nasal bone and
fuses to the septal cartilage in the midline

Front 4

NOSE

SKELETON: CARTILAGINOUS COMPONENTS
-major alar cartilage

Back 4

b. Major alar cartilage: L'-shaped plate; composed of a lateral crus that
supports the ala and a medial crus which forms the anteroinferior
part ofthe nasal septum with its fellow ofthe opposite side

Front 5

NASAL CAVITY

REGIONS
-vestibule
-olfactory region
-respiratory region

Back 5

II. Nasal Cavity
A. Regions

1. Vestibule: dilated region adjacent to the nostril; lined with hairs

2. Olfactory region: narrow region inferior to the cribriform plate (between
a superior nasal concha and the nasal septum); lined by a mucosa con-
taining olfactory neurons

3. Respiratory region: comprises most ofthe nasal cavity; lined by a glan-
dular, vascular mucosa