Ch 45: Nasal Cavity And Paranasal Sinuses

Question 1

The nasal cavity consists of four subsites

Answer 1

nasal vestibule, the lateral walls, the floor, and the septum.

Question 2

The ethmoid sinuses are composed of several small cavities, the ethmoid air cells, within the ethmoid labyrinth located below the anterior cranial fossa and between the nasal cavity and the orbit. They are separated from the orbital cavity by a thin, porous bone, the____ and from the anterior cranial fossa by a portion of the frontal bone, the

Answer 2

lamina papyracea,

fovea ethmoidalis

Question 3

The middle ethmoid cells open directly into the____ meatus. The anterior cells may drain indirectly into the middle meatus via the. ____The posterior cells open directly into the ____meatus.

Answer 3

middle

infundibulum

superior

Question 4

Maxillary sinus secretions drain by mucociliary action into the middle meatus via the

Answer 4

Hiatus semilunaris

Question 5

Ohngren line is a theoretical plane dividing each maxillary sinus into the suprastructure and infrastructure; it is defined by connecting the

Answer 5

medial canthus with the angle of the mandible

Question 6

Components of Ostiomeatal complex

Answer 6

maxillary ostium: drainage channel of the maxillary sinus
infundibulum: common channel that drains the ostia of the maxillary antra and anterior ethmoid air cells to the hiatus semilunaris
ethmoid bulla: usually a single air cell that projects over the hiatus semilunaris
uncinate process: hook-like process that arises from the posteromedial aspect of the nasolacrimal duct and forms the anterior boundary of the hiatus semilunaris
hiatus semilunaris: final drainage passage; a region between the ethmoid bulla superiorly and free-edge of the uncinate process