Nasa Cavities And Paranasal Sinuses Flashcards
What kind of cartilage is the allof nose
Fibro-areolar tissue
Why do u not use adrenaline near nasal cartilages
Cartilage is a vascular doesn’t have own blood supply relies on nutrient diffusion from skin
Adrenaline causes vasoconstriction
What is the philtrum
Indentation between nose and upper lip
What does the ethmoid bone contribute to the nasal cav
Roof - crubiform plate and Cristae gali
Lateral wall - superior and Middle conchae, ethmoidal air cells
Septum - perp plate of ethmoid
Why is a septal has aroma incised and drained
Prevent a vascular necrosis of septal hyaline cartilage which depends on diffusion of nutrients from its attached nasal mucosa
What I the epithelia of the vestibule of the nose
Keratinised stratified squamous for protection
What is the respiratory mucosa like in the nasal cav
Sec goblet cells
Cilia
Protection and moisture
What is the olfactory mucosa like in the nasal cav
Sense of smell
Need to be aq to get smell
What is the olfactory nerve
Cranial nerve 1
Receptor cells pass through crubiform plate of ethmoid bone
In olfactory mucosa
Have olfactory bulb and olfactory tract
Where is the olfactory mucos
On be out lateral wall and septum
What su the sensory innervation of the nasal cav
Trigeminal
Opthalmic v1 anterosupriorly
- anterior and posterior branches of ethmoidal nasociliary nerve
Maxillary v2 posteroinferior
- nasopalatine and grater palatine nerves
How does the Opthalmic artery supply arterial blood supply
Via anterior and posterior ethmoidal arteries on lateral wall and septum
How does the maxillary artery deliver arterial supply to e nasal cav
Via sphenopalatine and greater palatine arteries same on later wall and septum
How does the facial artery supply arterial blood supply to the nasal cav
Via lateral nasal branch of facial or SEPTAL BRANCH LF SUPEIROR LABIAL ARTERY
What is kiesselbachs area
An arterial anastamosis on nasal septum only A common site of epistaxis - nosebleeds Contributing arteries - Labial Ethmoidal Greater palatine Sphenopalatine
What are the conchae and what do they do
Superior and Middle are part of ethmoid Inferior is individual Improve gas exchange as turbulate the air War a nd humidfy air Rid bacteria and dirt Increase sa
What are the meat uses in the nasal cav
Spaces under conchae Sphenoethmoidal recess Superior meatus Middle meatus Inferior meatus
Paranasal sinuses drain to these
What separates the right nd left cavities
Nasal septum
What forms the nasal septum
Perp plate of ethmoid
Vomer
Septal cartilage
What comes the roof of the nasal cav
Nasal bones
Crubiform plate of ethmoid
What is Resp epi
Pseudostratified columnar with cilia and goblet cells
What are Ostia
Holes
Recesses and meatuses of lateral walls allowing drainage of mucous from paranasal sinuses
What are the paranasal sinuses
Air filled spaces
Frontal - 2 of them sep by bony septum
Maxillary - 2 sep
Ethmoid - 2 sets have ethmoidal air cells lots. Of little spaces
Sphenoid - vary
What epi lines the paranasal sinuses
Mucous secreting respiratory mucosa
What is the function of the paranasal sinuses
Secreting mucous
Help resonate voice
Lighten head
Buoyancy
Where does the frontal sinus drain to
Middle meatus
Where does the sphenoidal sinus drain to
Sphenoethmoidal recess
Where does the maxillary sinus drain to
Middle meatus
Where do the ethmoidal air cells drain to
Superior and Middle meatuses
What happens to lacrimal fluid drainage
Tears drains to nasolacrimal duct
This drains to inferior meatus
What is sinusitis
Infection/inflammation of the mucosa of paranasal sinuses
Can involve 1/more sinuses
There can be acute or chronic
WhT are the causes of sinusitis
Infection
Allergy
Autoimmune issues block up leading to infection
What do the cilia of the RESP epi do
Waft mucous towards Ostia
What makes sinusitis painful
Affecting sensation from v1 And v2
Can get referred pain to teeth
How is the maxillary sinuses predisposed to becoming inflamed
Ostia being located superiorly in medial wall of sinus compared to floor
Therefore mucous has to drain against gravity difficult to drain
What can happen when extract a maxillary molar
Oroantral fistula which. Is a hole between oral cav and maxillary sinus
This can cause infection
What kind of cartilage is nasal cartilage
Hyaline
