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ANA534 Nasal Cavity

learning objective answers to nasal cavity

QuestionAnswer
Name the main cartilages that form the external nasal skeleton. Lateral nasal cartilages and the greater alar cartilages.
List the bones that form the lateral wall of the nasal cavity. The main part of the lateral wall is formed by the maxilla, palatine, and sphenoid bones. The ethmoid, lacrimal, and inferior nasal concha are superimposed over these.
Which of the nasal conchae is an individual bone? Two which bone do the other 
two belong? The inferior concha is an individual bone. The middle an d superior conchae are parts of the ethmoid bone.
How is the nasal septum constructed? By the perpendicular plate of ethmoid, vomer, and septal cartilage.
What is a meatus? The space under a nasal concha (turbinate bone).
List the 4 paired paranasal air sinuses Frontal sinus, Maxillary sinus, Ethmoidal air cells, Sphenoid sinus
Which of the four sinus is most likely to become infected from an abscessed tooth? The maxillary sinuses.
Where is the olfactory epithelium located? On the roof of nasal cavity and extending for a short distance down medial septum and surface of the superior concha.
What are filia olfactoria? The axons of the olfactory epithelium.
What is the function of the cribriform plate of the ethmoid bone? To allow filia olfactoria of the olfactory epithelium to pass superiorly into cranial cavity (bulb).
Where do the olfactory axons first synapse? In the olfactory bulb that lies on top of each cribriform plate.
What is anosmia? Loss of the sense of smell.
Which two specific divisions of the trigeminal nerve are responsible for innervation 
of the lateral and medial walls of the nasal cavities? The ophthalmic (V1) and maxillary (V2) divisions of CN V.
Which specific nerve innervates the anterior and upper regions of the medial and 
lateral walls of the nasal cavity? The anterior ethmoidal nn.
Which specific nerve innervates the lower and posterior regions of the medial and 
lateral walls of the nasal cavity? Maxillary nerve from the sphenopalatine ganglion.
Which specific nerve innervates the skin of the vestibule of the nasal cavity? The infraorbital nerve (V2).
Which two general vessels supply the walls of the nasal cavity with blood? The external and internal carotid aa.
Which specific vessels supply the anterior and upper regions of the medial and lateral walls of the nasal cavity? The anterior and posterior ethmoidal aa. off the ophthalmic a. (internal carotid).
Which specific vessels supply the lower and posterior regions of the medial and 
lateral walls of the nasal cavity? The sphenopalatine and greater palatine br. off the maxillary a. (external carotid).
Which specific artery supplies the skin of the vestibule of the nasal cavity? The superior labial aa. off the facial (external carotid).
How do the larger vessels and nerves that supply the posterior and lower regions 
of the medial and lateral walls of the nasal cavity gain access to the cavity? Through the sphenopalatine foramen.
site of drainage of the frontal sinus hiatus semilunaris of middle meatus
site of drainage of the maxillary sinus hiatus semilunaris of middle meatus; Ethmoidal air cells Sphenoid sinus: sphenoethmoidal recess.
site of drainage of the ethmoidal air cells (anterior) hiatus semilunaris; (middle) bulla ethmoidalis of middle meatus; (posterior) superior meatus;
site of drainage of the sphenoid sinus sphenoethmoidal recess.
Created by: wiechartm
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