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Development of nose
Roll no 1305
ANATOMY OF EXTERNAL NOSE
av sharmaRoll no 1305
The Nose
• The nose consists of the external nose and the nasal cavity,
• Both are divided by a septum into right and left halves.
EXTERNAL NOSE
Pyramidal shaped, with its root up and the base directed
downIt has osteocartilaginous framework covered by
muscles and skin
External Nose
• The external nose has two elliptical orifices called the naris (nostrils), which are separated from each other by the nasal septum.
• The lateral margin, the ala nasi, is rounded and mobile.
External Nose
OSTEOCARTILAGINOUS FRAMEWORK
Upper one third is bonyLower two third is
cartilaginous
BONY PART• The framework of
the external nose is made up above by the nasal bones, the frontal processes of the maxillae, and the nasal part of the frontal bone.
CARTILAGENOUS PART
UPPER LATERAL CARTILAGE situated below the inferior margin of the nasal bone, and is flattened, and
triangular in shapesuperior margin is attached to the
nasal bone and the frontal process of the maxilla; its inferior margin is
connected by fibrous tissue with the greater alar cartilage.
Greater alar cartilage (lower lateral cartilage) is a thin,
flexible plate, situated immediately below the
lateral nasal cartilage, and bent upon itself in such a manner as
to form the medial wall and lateral wall of the naris of its
own side.
LESSER ALAR CARTILAGE the part of the nose which forms the lateral wall is curved to correspond with the ala of the nose; it is oval and flattened, narrow behind, where it is
connected with the frontal process of the maxilla by a tough fibrous membrane
Septal nasal cartilagecontinuous with the anterior margins
of the lateral cartilages; below, it is connected to the medial crura of the
greater alar cartilages by fibrous tissue.
Its posterior margin is connected with the perpendicular plate of the ethmoid
; its inferior margin with the vomer and the palatine processes of the
maxillae.
NASAL MUSCULATURE
VARIOUS MUSCLES GROUPS,,the elevator muscle group — • procerus muscle and• the levator labii superioris alaeque nasi muscle.•the depressor muscle group —• alar nasalis muscle and •the depressor septi nasi muscle.•the compressor muscle group —• transverse nasalis muscle.•the dilator muscle group —• dilator naris muscle that expands the nostrils;• it is in two parts:anterior and posterior
Blood Supply of the External Nose
• The skin of the external nose is supplied by branches of the ophthalmic and the maxillary arteries.• The skin of the ala and the lower
part of the septum are supplied by branches from the facial artery.
Nerve Supply of the External Nose
• The infratrochlear and external nasal branches of the ophthalmic nerve (CN V) and the infraorbital branch of the maxillary nerve (CN V).
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