Upper airway Flashcards
Where does the eustachian tube connect to from the ear?
Into the nasopharynx
What sticks into the nasal cavity
Turbinate bones
What is conchae. What type of epithelium in the nose
Turbinate bone + soft tissue. Covered in respiratory epithelium
ciliated psudeostratified epithelium, interspersed with mucus-secreting goblet cells.
How many conchae
3 (sup. mid. inf.)
What are the sup. mid and inf meatuses of the nasal cavty
spaces between the protruding conchae
Sup= between superor and middle conchae etc.
Function of conchae
Warm and humidify air, help trap pathogens
Learn the bones of the nose
Learn
Innervation to the nasal cavtiy
Olfactory nerve (I)- olfaction
Trigeminal nerve (V1 for anterior and V2 for posterior region)
Facial nerve- glands (i.e. nasolacrimal glands)
Sympathetic nerves from T1 for vascular smooth muscle
Blood supply of nasal cavity
Branches of the internal carotid and the external carotid
INTERNAL: anterior and posterior ethmoidal arteries (branches of opthalmic)… they descend into nasal cavity through cribiform
EXTERNAL: Sphenopalatine artery Greater palatine artery Superior labial artery Lateral nasal arteries
they form anastomoses
Venous drainage of nasal cavity
Top part drains into the cranial cavity
rain into the pterygoid plexus, facial vein or cavernous sinus.
Innervation of the different sinuses
Frontal- V1 (this is located where you touch for cranial nerve V1!)
Ethmoidal air cells (=sinus but like honeycomb)- V1&2
Sphenoid- V1&2
Maxillar- V2 (think this is where you touch to test for cranial nerve V2!)
How do sinuses appear on x-ray
Dark
Where do the sinuses drain
Into the meatuses between conchae
Where do following sinuses drain into the nasal cavity:
- Frontal
- Ethmoidal
- Sphenoid
- Maxilary
The paranasal sinuses drain into the nasal cavity. The frontal, maxillary and anterior ethmoidal sinuses open into the middle meatus. The location of this opening is marked by the semilunar hiatus, a crescent-shaped groove on the lateral walls of the nasal cavity.
The middle ethmoidal sinuses empty out onto a structure called the ethmoidal bulla. This is a bulge in the lateral wall formed by the middle ethmoidal sinus itself. The posterior ethmoidal sinuses open out at the level of the superior meatus.
The only structure not to empty out onto the lateral walls of the nasal cavity is the sphenoid sinus. It drains onto the posterior roof.
In addition to the paranasal sinuses, other structures open into the nasal cavity:
Nasolacrimal duct – acts to drain tears from the eye. It opens into the inferior meatus.
Auditory (Eustachian) tube – opens into the nasopharynx at the level of the inferior meatus. It allows the middle ear to equalise with the atmospheric air pressure.
What is the larynx made of
cartilage, membrane and muscles
Function of larynx
VALVE and sound produceer
Where does the hyoid bone lie
Between the mandible and the thyroid cartilage
What membrane lies beneath the thyroid cartilage and cricoid cartilage
cricothyoid membrane
T/F the cricoid is larger anteriorly
F is it larger posteriorly
How is the tension on the vocal folds controlled
By muscle and by the thyroid cartilage rocking on the cricoid cartilage