Development of nasal cavity Flashcards
As the face develops, the nasal placodes become depressed,
forming
Nasal pits
The nasal pits deepen dorsally in the 6th week to form
Primordial nasal sacs
The primordial nasal sacs are separated from the oral cavity by
Oronasal membrane
At the end of the 6th week , the oronasal membrane ruptures forming
Primitive choanae
What happens as a result of the rupture of the oronasal membrane
The nasal cavity communicates with the primitive oral cavity
Where does the primitive choanae lie
At the junction of primitive nasal and oral cavities immediately behind primary palate
After the secondary palate develops, where is the primitive choanae located
Junction of nasal cavity and pharynx
External openings of nasal pits persists as
External nares
The superior middle and inferior nasal conchae develop as
Elevations of the lateral walls of the nasal cavity
Ectoderm lining roof of nasal cavity becomes specialized to form
Olfactory epithelium
Olfactory epithelium provides origin of
Olfactory nerves
The paranasal air sinuses develop as
Diverticular from walls of nasal cavities
They grow into surrounding bones and become
Air filled
The bones the paranasal air sinuses grow into include
Maxilla
Ethmoid
Frontal
Sphenoid
The primitive openings of the sinuses persists as
Orifices of the adult sinuses
