Nasal Cavity Flashcards
paranasal sinuses
frontal
sphenoid
ethmoid
maxilla
form post-natally - epithelial lined
maxillary sinuses
largest sinus
drains to middle meatus
- only one draining up**
- susceptible to infection
nerve - V2
frontal sinus
between cranial and nasal cavities
frontonasal duct to semilunar hiatus in middle meatus
nerve - V1
semilunar hiatus
in middle nasal meatus
drainage from maxillary and frontal sinuses and anterior ethmoid air cells
sphenoidal sinus
opens to sphenoethmoidal recess
nerve - V2
ethmoidal sinus
anterior, middle, posterior air cells
nerve V1
drainage of anterior ethmoid air cells
semilunar hiatus - middle nasal meatus
drainage of middle ethmoid air cells
ethmoid bulla
drainage of posterior air cells
superior nasal meatus
sinusitis
inflammation
transillumination to detect fluid
infections can spread
**maxillary most suspeceptible
maxillary teeth infection
to maxillary sinus
nares
external openings of nose
external nose
bone and cartilage
roof of nasal cavity
mainly ethmoid - cribriform plate
frontal
sphenoid
lateral wall of nasal cavity
ethmoid - superior and middle concha inferior concha maxilla palatine - perp plate lacrimal bone
concha bones?
superior and middle - ethmoid
inferior - its own bone
floor of nasal cavity
palatine bone
maxilla bone
anterior wall nasal cavity
nasal cartilages, nasal bones
nares
posterio wall of nasal cavity
open to nasopharynx via choanae
choanae
open to nasopharynx from nasal cavity
medial wall nasal cavity
nasal septum
- perpendicular plate ethmoid
- vomer
- nasal cartilage
deviated septum
can affect breathing
nasal mucosa
lines bulk of cavity
-rich in blood vessels and mucous glands to warm air
olfactory epithelium lines superoposterior part of cavity
-CN I
rhinitis
inflammation of nasal mucosa
infection spread:
- anterior cranial fossa via cribriform
- nasopharynx
- middle ear via pharyngotympanic tube
- lacrimal apparatus and conjuctiva via nasolacrimal duct
- paranasal sinuses
sphenoethmoidal recess
area posterior and superior to superior concha
-opening for sphenoid sinus
superior nasal meatus
beneath superior concha
-opening for posterior ethmoidal sinus
middle nasal meatus
beneath middle concha
- bulla ethmoidalis and semilunar hiatus
- opening for frontal, maxillar, A/M ethmoidal air cells
middle ethmoid - ethmoidalis bulla
inferior nasal meatus
beneath inferior concha
-openings for nasolacrimal duct
frontal sinus drainage
frontonasal duct
semilunar hiatus
middle nasal meatus
maxillary sinus drainage
semilunar hiatus
middle nasal meatus
anterior ethmoid air cell drainage
semilunar hiatus
middle nasal meatus
middle ethmoid air cell drainage
ethmoid bulla
middle nasal meatus
posterior ethmoid air cell drainage
superior nasal meatus
nasolacrimal duct drainage
inferior nasal meatus
blood supply from internal carotid a
anterior and posterior ethmoidal arteries
-branches of opthalmic a
blood supply from external carotid a
sphenopalatine a
greater palatine a
facial a
kisselbach area
anastomose between:
- greater palatine a
- anterior ethmoidal a
- sphenopalatine a
- facial a
NO POSTERIOR ETHMOIDAL**
anterior portion of nasal septum
-compress here to stop nose bleed
major artery to nasal cavity
sphenopalatine a
chronic nosebleeds involve this often**
olfactory nerve
SVA CN I
bipolar neurons in superior nasal cavity epithelium
neuron processes through cribriform plate
-synapse olfactory bulb
olfactory bulb
extension of forebrain (telencephalon)
-CN I synapse directly with forebrain**
ophthalmic nerve
V1 - GSA to nose and sinuses
branch of trigeminal
enters orbit via superior orbital fissure
branches of ophthalmic nerve
supraorbital n
supratrochlear n.
posterior ethmoidal n.
anterior ethmoidal n.
nerve to frontal sinus
V1 - supraorbital and supratrochlear
ethmoid sinus nerve
posterior ethmoidal n
anterior ethmoidal n
provides:
- branches to ethmoidal air cells
- septal branches
- lateral branch nasal cavity
- external nasal branch - dorsum of nose
maxillary nerve
V2 - branch of trigeminal
enters PPF via pterygopalatine fossa
-GSA to nose and sinuses
branches of V2
infraobribal posterior superior alveolar nasopalatine posterior superior lateral nasal posterior inferior lateral nasal
majority of innervation to nasal septum
nasopalatine n
maxillary sinus nerve
infraorbital
-via V2
also to face and lateral nose
maxilalry sinus nerve
posterior superior alveolar n
-via V2
superior lateral nasal wall nerve
posterior superior lateral nasal n
posterior inferior lateral nasal wall nerve
posterior inferior lateral nasal n
parasympathetic to paranasal sinuses
preganglionic - salivatory nucleus
travel with CN VII - greater petrosal branch
- joins deep petrosal nerve
- form nerve to pterygoid canal
synapse at PPG
-postganglionic with V2 > nasal cavities and sinuses
sympathetics to paranasal sinuses
preganglionic T1 - 4
postganglionic SCG
-fibers with internal carotid n > deep petrosal n
with greater petrosal nerve
-form nerve to pterygoid canal
- synapse at PPG
- postganglionic with V2 > nasal cavities and sinuses
lymph drainage of nasal cavities
anterior portion - submandibular nodes
posterior portion - retropharyngeal nodes
