Flashcards in Week 7 Nasal Cavity, Paranasal Sinuses, and pterygopalatine Fossa Deck (8)
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1
List the paranasal sinus openings and locations of the openings in the nasal cavity.
1. Superior meatus:
-posterior ethmoids
2. middle meatus:
-opening of frontal sinus
-opening of maxillary sinus
-ethmoid openings (superior and middle)
3. inferior meatus
-nasolacrimal duct opening
2
What are the 6 openings in and out of the pterygopalatine fossa? What structures go through these openings?
1. Foramen rotundum: V2
2. Pterygoid canal: greater petrosal nerve
3. greater palatine foramen: greater and lesser palatine nerves
4. Inferior orbital fissure: infraorbital nerve and artery
5. Pterygomaxillary fissure: maxillary artery
6. sphenopalatine foramen: sphenopalatine artery
3
Describe the blood supply to the nasal cavity.
1. Three terminal branches of the maxillary artery
a. Sphenopalatine artery: posterior 2/3 of nasal cavity
b. infraorbital artery:
c. descending palatine artery: runs along inferior surface of hard palate, supplies hard and soft palate
2. opthalmic artery branches (V1): anterior superior nasal cavity
4
Where do nosebleeds predominantly occur?
-Kiesselbach's area: anastmoses of arteries in anterior third of septum between branches of internal and external carotid arteries
-10% of nosebleeds are posterior, rest are anterior
5
What cell bodies are located in the Pterygopalatine ganglion?
-para/post
6
Trace the pathway of the facial nerve innervation to the lacrimal gland, nasal and pal tine mucous glands.
1. Para/pre
-facial nerve-->greater petrosal n.-->nerve of pterygoid canal-->pterygopalatine ganglion
A. -->branches of V1/V2-->lacrimal nerve-->lacrimal gland
B. -->greater palatine n. -->nasal and palatine mucosa
7
What is the sensory innervation distribution of the nasal cavity?
1. Maxillary (V2) branches provides SS to posterior 2/3 of lateral and medial walls of nasal mucosa+hard/soft palate
-greater palatine: hard palate
-lesser palatine: soft palate
2. Ophthalmic (V1)-nasocilliary branches supplies anterior 1/3, lateral and medial wall
3. Roof of cavity has special sense from CN I
8
