DEVELOPMENT OF SURGERY
DEVELOPMENT OF SURGERY

Development of nasal Cavity starts by the formation of nasal placode.

Initially, a nasal placode (ectoderm thickening) appears bilaterally at the rostral end of the frontonasal prominence.

Subsequent growth of surrounding medial and lateral nasal processes forms a nasal pit (bilaterally).

nasal cavity
nasal cavity

Continued growth of each nasal pit, plus wall erosion, produces a primitive nasal cavity that communicates bilaterally, with the oral cavity.

The bilateral rostral openings of the nasal cavity becomes external nares (nostrils) and ectomesenchyme surrounding them forms cartilage of the nose.

Each lateral nasal process give rise to alar cartilage of the nose, nasal bone and lacrimal bone. A nasolacrimal duct is formed by ectoderm along the seam where the lateralnasal process meets the maxillary process.

Fusion of right and left medial nasal processes forms a primary palate rostrally and the nasal septum caudally.

development of nasal cavity,6th week
development of nasal cavity,6th week

– The incisive bone, including upper incisor teeth and the rostral upper lip, are derived from the primary palate.

– The nasal septum consists of bone, cartilage, and a patch of soft tissue membrane that separates right & left halves of the nasal cavity.

now there is a connection between nasal and oral cavity,Nasal and oral cavities communicate with one another following erosion of an oronasal membrane that initially separated them.

In mammals, nasal and oral cavities are again separated by formation of a secondary palate that shifts the nasal-oral communication caudally into the pharynx.

 

development of nose 8th week
development of nose 8th week

In mammals, nasal and oral cavities are again separated by formation of a secondary palate that shifts the nasal-oral communication caudally into the pharynx.

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