CN V. ophthalmic CN V1- anterosuperiorly Maxillary CN V2- posteroinferiorly
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what is the blood supply of the nasal cavity
from both - external and internal carotid arteries. external: facial and maxillary Internal: ophthalmic
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via what arteries does the ophthalmic, maxillary and facial artery supply. blood to nasal cavities
ophthalmic: via anterior and posterior ethmoidal arteries. maxillary artery: via sphenopalatine and greater palatine arteries. Facial: via septal branch of superior labial artery/ lateral nasal branch of facial
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what is kiesselbach's area
an arterial anastomosis on the nasal septum. a common site of epistaxis
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what are meatuses and give some examples
spaces under each concha. sphenoethmoidal, superior middle and inferior
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what are paranasal sinuses
air filled spaces within bones
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how many sinuses in the frontal bone, maxillae, ethmoid bone, sphenoid bone
frontal bone- 2 front sinuses separated by bony septum. maxillae: 2 maxillary sinuses. ethmoid: 2 sets of ethmoidal air cells. sphenoid: 1 or 2 sphenoidal sinuses
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what are the sinuses lined by
by mucous secreting respiratory mucosa
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via what does the mucous drain into the nasal cavities
via ostia in the lateral walls of the nasal cavities
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where does the sphenoidal sinus , ethmoidal cells , the frontal sinus and the maxillary sinus drain
sphenoidal- into the sphenoethmoidal recess. ethmoidal cells: into the superior and middle meatuses. frontal sinus: into the middle meatus. maxillary: into the middle meatus
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what is the lacrimal fluid drainage
lacrimal gland produces tears, wash over eye, drain into nasolacrimal duct, which drain into inferior meatus of nasal cavity
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what is sinusitis and what are the causes
inflammation of the mucosa of paranasal. infection, allergy and autoimmune issues
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how does the cilia play a part in. sinusitis
cilia of respiratory mucosa waft mucous towards ostia. cold weather/ smoking can. interfere with cilia
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how can viral. URTI play a part in sinusitis
viral URTI can cause swelling of mucosa, reducing diameter of ostia- sinuses-excess mucous produced and build up
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why does the maxillary sinus mucous have to drain against gravity
due to maxillary sinus ostia being located superiorly in the medial wall of the sinus compared to the floor
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extraction of a tooth may result in ..
an oro-antral fistula
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how may a maxillary sinusitis present and why
xmaxillary sinusitis may present as “toothache” of an upper or lower tooth due to the common sensory nerve supply from CN V of :the maxilla/mandible the antral mucosa all the teeth
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what is the nasal septum formed from
the perpendicular plate of the ethmoid bone & the vomer (posteriorly) and the septal cartilages (hyaline) anteriorly
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what are the functions of nasal cavities
convey respiratory gases between atmosphere and nasopharynx warm humidify remove particulate matter special sense of smell (olfactory area) OSTIA (singular ostium)/“holes” in the recesses & meatuses of the lateral walls allow drainage of mucous from
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continued
the paranasal sinuses
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Other cards in this set
Card 2
Front
what makes up the roof of the ethmoid bone
Back
the cribriform plate and crista galli (+anterior cranial fossa)
Card 3
Front
what makes up the lateral wall of the ethmoid bone
Back
Card 4
Front
What makes up the septum of the ethmoid bone
Back
Card 5
Front
what le front fractures can fracture the cribriform plate
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