Nasal cavity Flashcards
What are choanae?
-Choanae are open back walls of nasal cavity at junction with nasopharynx
what are conchae?
They protrude airspace
- covered with mucoperiosteum with a rich blood supply
- warm and humidify inspired air for maximum olfactory efficiency.
- the conchae also traps contaminates
What are the superior, middle and inferior meati?
spaces between conchae and lateral wall of the nasal cavity
What is the sphenoethmoid recess?
- its the space inferior to the wall of cranial fossas and superior surface of superior choncha.
- site where olfactory nerves are distributed
- where sphenoid sinus drains
What are the paranasal sinuses?
are mucorperiosteal lined cavities in bones near nasal cavity and are distrubted into
-frontal
-sphenoidal
-ethmoidal (anterior, mid and posterior) On each side
-maxillary (virtually hollows upper jaw)
they develop with age as they are not seen in new borns.
What can you find in the maxillary sinus?
Infraorbital canal (Infraorbital a &nerve) runs in roof of sinus -middle and anterior alveolar nerves run in lateral walls of sinus
All sinuses communicate with nasal cavity
- Sphenoid via sphenoethmoidal recess
- posterior ethmoidal via superior meatus
- all others communicate with middle meatus
What is the hiatus semilunaris?
a curved slit with rounded superior edge known as the ethmoidal bulla. osteum of the maxillary sinus opens in hiatus
What is the infundibulum?
opening of frontonasal duct just anterosuperior to hiatus semilunar
What is the nasolacrimal duct?
not a sinus but communicates with inferior meatus; excess tears humidify nasal cavity.
Special sense nerve
See CN I distribution
what supplies general sensory to anterior ethmoidal to anterior 1/2 of both medial and lateral walls atrium and vestibule?
CN V1
