Unit 4 - Head and Neck: Paranasal Sinuses (Ex. III)

Question 1

frontal sinuses

Answer 1

asymmetrical
above root of nose
drain into middle meatus via frontonasal duct –> hiatus semilunaris

Question 2

sphenoid sinuses

Answer 2

form w/in body of sphenoid
between L and R cavernous sinuses
drain into sphenoethmoidal recess in P-S part of nasal cavities above S concha

Question 3

ethmoid sinuses

Answer 3

make up M wall of orbit
formed by thin-walled ethmoidal air cells
between orbits above nasal cavities
drain into S and middle meatuses

Question 4

maxillary sinuses

Answer 4

largest of paranasal sinuses
on either side of nasal cavities I to orbits
drain into middle meatuses
most common for sinuses infections

Question 5

What is the nasolacrimal duct?

Answer 5

drains tears from M corner of eye and takes them to the I meatus on each side

Question 6

What are they?

Answer 6

air-filled cavities w/in bones of skull

communicate w/ nasal cavities