Flashcards in Nasal Cavity And Paranasal Sinuses Deck (96)
Shape of the nose
-upper end is root
-free tip is apex
Dorsum of nose
Extends from root to apex, in midline
What are the two inferior apertures of the nose?
The nares (nostrils)
What is each nostril limited by?
Laterally by the ala of nose
What is the supporting framework of nose composed of?
Bone and hyaline cartilage
What part of the nose does the bony framework support?
What does the bony framework consist of?
Nasal bonds and frontal processed of maxillae
What supports the lower part of the nose?
What does the cartilagenous framework consist of?
One septal and two major alar cartilages
What ar the cartilages connected to each other and the bone by?
What is the largest cartilage of the nose?
-Forms anterior part of the nasal septum
-Has 2 lateral processes (triangular in shap, located below inferior border of nasal bone
Major alar cartilages
-u-shaped, form lateral and medial borders of the nostrils (lateral and medial crura, respectively)
What is the nasal cavity?
Chamber consisting of bony cartilaginous walls, covered with mucosa
Where does the nasal cavity open?
Anteriorly on face via the nares
What does the nasal cavity communicate with posteriorly and by what?
Nasopharyngeal via posterior nasal aperture (choanae)
The area immediately above the nares
What is the vestibule lined with?
Skin and stiff hairs
Functions of nasal cavity
-conditioning of inspired air (filtration, humidification, warming)
-reception of secretions from paranasal air sinuses and nasolacrimal duct
Superior relationship of nasal cavity
Anterior cranial fossa separated by cribiform plate
Lateral to upper part of the nasal cavity
Ethmoidal air cells and orbit
Lateral to lower part of nasal cavity
Inferior relationship to nasal cavity
Oral cavity separated by hard palate
Posterior relationship to the nasal cavity
Nasopharynx via choanae
Composition of the bony walls of the nasal cavity: floor
Hard palate (palatine processes of maxillae and horizontal plates of palatine bones
Composition of the bony walls of the nasal cavity: roof
From anterior to posterior: nasal bone, nasal spins of frontal bone, cribiform plate of ethmoid, anterior and inferior aspects of body of sphenoid
Composition of the bony walls of the nasal cavity: medial wall (nasal septum)
Perpendicular plate of ethmoid and vomer ( and small contributions from sphenoid, maxilla, and palatine)
Composition of the bony walls of the nasal cavity: lateral wall
Maxilla, lacrimal bone, inferior nasal choncha, ethmoidal labyrinth, perpendicular plate of palatine, and medial pterygoid plate
What are the 3 scroll-like bony projections on the lateral wall f the nasal cavity?
Superior, middle, and inferior nasal conchae