Flashcards in 4.3 Nasal Cavity and Pterygopalatine Fossa Deck (63)
What empties into the inferior meatus?
nasolacrimal duct, channeling tears from the conjunctival sac
What empties into the hiatus semilunaris of the middle meatus?
frontal sinus via the frontonasal duct, maxillary sinus, and anterior ethmoidal air cells
What empties onto the surface of the ethmoidal bulla in the middle meatus?
middle ethmoidal air cells
What empties into the superior meatus?
posterior group of ethmoidal air cells
What drains into the sphenoethmoidal recess (above the superior concha)?
What innervates the anterior and upper regions of the lateral and medial walls of the nasal cavity?
general sensation from branches of the anterior ethmoidal n. (V1)
What innervates the lower and posterior portions of the walls of the nasal cavity?
maxillary n via branches from the pterygopalatine ganglion
The pterygopalatine ganglion hangs behind the ....
What foramen does the nasopalatine n pass through?
What supplies a portion of the mucosa lining the hard palate?
nasopalatine n. (V2)
The skin of the vestibule is supplied by a branch from the ...
infraorbital n. (V2)
Anterior and posterior ethmoidal aa. are branches from what artery?
What a. is a direct continuation of the maxillary a. after it leaves IFT?
Rupture of what branches commonly give rise to nosebleeds?
labial a. branches
What travels through the pterygopalatine fossa?
3rd segment of maxillary a., maxillary n., and autonomic nerve fibers (parasympathetics from CN VII, as well as sympathetics)
What are the anterior boundaries of the pterygopalatine fossa?
maxilla and maxillary sinus
What are the posterior boundaries of the pterygopalatine fossa?
pterygoid process of sphenoid, cranial cavity (foramen rotundum), nasopharynx (pharyngeal canal)
What are the lateral boundaries of the pterygopalatine fossa?
IFT (pterygomaxillary fissure)
What are the medial boundaries of the pterygopalatine fossa?
perpendicular plate of the palatine bone (sphenopalatine foramen), and nasal cavity
What are the superior boundaries of the pterygopalatine fossa?
greater wing of sphenoid bone (inferior orbital fissure)
What are the inferior boundaries of the pterygopalatine fossa?
pyramidal process of palatine bone, palate/oral cavity (palatine canal, and greater and lesser palatine foramina)
Where does CN V2 travel after exiting the cranial vault via foramen rotundum?
enters pterygopalatine fossa and gives off several branches
What does the greater palatine n. innervate?
palatal mucosa and palatal (lingual) gingiva posterior to the maxillary canines
What does the lesser palatine n. innervate?
mucous membranes and glands of soft palate, uvula and palatine tonsil
What does the nasopalatine n. (long sphenopalatine n.) innervate?
nasal septum and palatal mucosa anterior to the maxillary canines
What does the posterolateral nasal branches (short sphenopalatine n.) innervate?
mucous membrane of the lateral wall of the nasal cavity
What does the pharyngeal branches innervate?
mucous membranes of sphenoidal sinus and nasopharynx
The zygomatic n. passes through the lateral wall of the orbit and communicates with the ...
lacrimal n. CN V1
What type of fibers from the pterygopalatine ganglion travel with the zygomatic n. to reach the lacrimal gland?
postganglionic parasympathetic fibers