Nasal Cavity Terms and Definitions | Biology Study Set

the nasal cavities communicate with the outside environment via what?

external nares

the external nose is predominantly what?

cartilaginous

what are the cartilaginous portions of the nose?

- lateral nasal cartilages

- major alar cartilages

- minior alar cartilages

the bridge of the nose is made from what?

nasal bones

we get processes of the nose from what?

- frontal bone (nasion)

- maxillae

the nasal cavity is divided into a right and left cavity by what?

the nasal septum

the internal nares (choanae) are located where?

just before the pharynx

what is a clinical correlate of the nasal cavity?

NG tube placement for eating

deep to the nasal septum would be what?

the nasal cavity

what bones make up the nasal septum?

- perpendicular plate of ethmoid

- vomer

- septal cartilage (cannot see in a coronal view)

what is a clinical correlate of the nasal septum?

it can be deviated!

what is the roof of the nasal cavity?

- nasal bone, frontal bone, ethmoid bone, sphenoid bone

what do each of these bones have in common?

Nasal bone, frontal bone, ethmoid bone, sphenoid bone

they all have a sinus that drains into the nasal cavity

what is the floor of the nasal cavity?

the palatine process of the maxilla and the horizontal plate of the palatine bone

what conchae are parts of the ethmoid bone?

superior and middle conchae

what conchae is its own bone?

inferior conchae

how does the appearance of the conchae bones contribute to their function?

they cause the air we breathe in to spiral and warm up (turbinate)

what is a natural body passage or canal?

a meatus

what are the 3 meatuses of the nasal cavity?

- superior meatus

- middle meatus

- inferior meatus

each meatus receives secretions from where?

paranasal sinuses

what happens once fluid is drained to the nasal cavity?

it is swallowed and travels to the stomach

the majority of the nasal cavity is covered by what?

respiratory epithelium

the upper 1/3 of the nasal cavity is composed of what epithelium?

olfactory

explain the olfactory bulb orientation

so we have an olfactory bulb with an olfactory tract connected to it...

filia olfactoria is found coming out of the olfactory bulb that travels through the cribriform plate of the ethmoid

what is the clinical implication of the filia olfactoria coming off the olfactory bulb?

they can shear off easily like a cheese grater during trauma

they can become inflamed leading to a loss of sense of smell

what are our paranasal sinuses?

- frontal sinus

- ethmoid sinus

- sinus

- sphenoid sinus

what is a function of the paranasal sinuses?

- lighten our skull

- resonate voices

where does the sphenoid sinus drain?

to the sphenoethmoid recess

where do the posterior ethmoid air cells drain?

the superior meatus

what drains into the middle meatus?

- anterior ethmoid air cells

- maxillary sinus

- frontal sinus

- middle ethmoid air cells

how do the anterior ethmoid air cells, maxillary sinus, and frontal sinus drain into the middle meatus?

via the hiatus semilunaris

how do the middle ethmoidal air cells drain into the middle meatus?

via bulla ethmoidials

where does the nasolacrimal duct drain?

inferior meatus

T/F: the nasolacrimal duct is a sinus

FALSE its just a duct

what is the nasolacrimal duct?

the tear duct!

what is a clinical correlate of the nasolacrimal duct?

puncta occlusion

what innervates the nasal cavity?

anterior: V1 via idk yet

posterior: V2 via nasopalatine

where do we have most of our blood supply in our noses? why does this matter?

anteriorly, it matters because it can cause nose bleeds with trauma