development of nose by av sharma

DEVELOPMENT OF NOSE

Roll no 1305

Development of nose

Roll no 1305

Appearance of NASAL PLACODES at the end of 4th week of IUL

Appears lateral to the FRONTONASAL prominence as a LOCAL THICKENING of SURFACE ECTODERM.

NASAL PITS are formed on 5th week of IUL, by invagination of NASAL PLACODES.

NASAL PROMINENCE are formed following the formation of NASAL PITSNASAL PROMINENCE divided into 2 subdivisions:

1. LATERAL nasal prominence 2. MEDIAL nasal prominence

Following 2 weeks after 5th week of IUL, maxillary prominence continue to INCREASE IN SIZE. Simultaneously, they grow medially, compressing the medial nasal prominence towards the midline.

In the formation of upper lip LATERAL NASAL PROMINENCE is not involved

The deep furrow which separates maxillary prominence and later nasal prominence is called as NASOLACRIMAL GROOVE.

Nasolacrimal groove forms NASOLACRIMAL DUCT and its upper wider end forms the LACRIMAL SAC.

Development of lateral wall of nose

During 8th week of IUL 6 to 7 ridges appear on the lateral nasal wall, those ridges are called as ETHAMO TURBINALS.

1st ETHAMO TURBINAL1. ASCENDING portion forms AGGER NASI2. DESCENDING portion forms UNCINATE

PROCESS 2nd ETHAMO TURBINAL forms MIDDLE

TURBINATE. 3rd ETHAMO TURBINAL forms SUPERIOR

TURBINATE 4th and 5th ETHAMO TURBINAL forms

SUPREME TURBINATE MAXILLO TURBINAL forms INFERIOR

TURBINATE

FURROWS between each ETHAMO TURBINALS forms respective NASAL MEATUSES

1st FURROW :- MIDDLE MEATUS (b/w 1st & 2nd ET) 2nd FURROW :- SUPERIOR MEATUS 3rd FURROW :- SUPREME MEATUS 4th FURROW :- INFERIOR MEATUS

DEVELOPMENTAL ANOMALIES

OF NOSE

PROBOSIS DEFORMITY ARHINIA (Nasal aplasia) POLYRHINIA (Double nose) CHOANAL ATRESIA NASAL DERMOID CYST NASAL GLIOMAS NASAL HEMANGIOMA (vascular

hamartoma)

NASAL MASS1. CYSTIC MASS

• MENINGOCOELE• MENINGOENCEPHALOCOEL

2. SOLID MASS GLIOMA CRANIOPHARYNGIOMA

CLEFT LIP and PALATE1. MEDIAN NASAL CLEFT2. MEDIAL NASAL CLEFT3. LATERAL NASAL CLEFT

ARHINIA

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