development of nose by av sharma
TRANSCRIPT
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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