8. the external nose and nasal cavity (workbook) Flashcards
Function of the nose and nasal cavity?
olfaction (smell)
filter inspired air
humidify inspired air
drainage of the secretions from Paranasal sinus and Nasolacrimal ducts
what is the external nose made up of?
predominantly cartilaginous structure
what forms the root of the external nose?
processes of maxillae and 2 nasal bones
bony part of external nose
what can injury to the nose cause?
septal deviation
nasal bone fractures
where does the nasal cavity extend?
from nostrils anterior (anterior nasal aperture) TO
posterior nasal aperture (choana, choanae)
what does the nasal cavity contain?
roof, floor, medial + lateral walls
where does the nasal cavity open into?
the nasopharynx
what are the major paranasal sinuses?
4: maxillary frontal ethmoidal sphenoid
which is the largest paranasal sinus?
maxillary
where does the maxillary paranasal sinus occupy?
most of the maxilla bone
what does the ethmoidal sinus collectively consist of?
anterior, middle and posterior air cells
what are the paranasal sinuses?
air-filled spaces within the skull, lined with respiratory mucosa
what is the respiratory mucosa lining the paranasal sinuses?
ciliated pseudostratified columnar with goblet cells
how do all the paranasal sinuses communicate?
with the nasal cavity via their respective openings
what does obstruction to drainage from a paranasal sinus lead to?
an accumulation of mucosal secretions and the development of infection causing an acute sinusitis
