26 Questions
What is the function of the paranasal sinuses?
To provide vocal resonance and lighten the skull bones
What innervates the mucosa of the paranasal sinuses?
Trigeminal nerve branches
Which bone divides the nasal cavity into two parts?
Ethmoid bone/Vomer
What is the function of the vestibule in the nasal cavity?
Entrance to the nasal cavity
Where are the conchae found in the nasal cavity?
On the lateral wall
Which area of the nasal cavity is involved in olfaction?
the upper 1/3
Which area on the anterior aspect of the nasal septum is where 5 arteries anastomose?
Kiessebach's area
Which meatus is inferior to the superior concha and drains the posterior ethmoid air cells?
Superior meatus
What structure drains the inferior meatus?
Nasolacrimal duct
From which artery does the anterosuperior blood supply of the nasal cavity primarily come?
Ophthalmic artery
Which nerve provides innervation to the anterosuperior part of the nasal cavity?
Nasociliary nerve (branch of ophthalmic nerve V1)
What drains into the sphenoidal sinus?
Posterior ethmoid air cells
Which artery does NOT contribute to the blood supply in Kiesselbach’s area?
Lateral nasal wall artery
Which of the following is the pterygopalatine fossa not a 'distribution center' for?
Lingual nerve
Where does the maxillary artery give off branches to in the pterygopalatine fossa?
Palate and nasopharynx
What type of fibers originate from the Superior Cervical Ganglion into the pterygopalatine fossa?
Sympathetic fibers
Which part of the face does the Maxillary nerve not give GSA branches to?
Forehead
Where does the Maxillary artery travel after supplying muscles of mastication?
Infratemporal fossa
Which of the following bones is the paranasal sinus not found in
Temporal
Which of the following is not found in the middle meatus?
Posterior ethmoid air cells
What drains in the sphenoethmoidal recess?
Sphenoidal sinus
What is the pharyngotympanic tube?
The auditory tube
What is the blood supply for the posteroinferior portion of the nasal cavity?
Maxillary artery
What innervates the posteroinferior aspect of the nasal cavity?
Maxillary nerve (V2
What are the boundaries of the pterygopalatine fossa?
Pterygoid process of the sphenoid bone and the posterior aspect of the maxilla
The pterygopalatine (GVEp) ganglion is suspended from The Maxillary division of Trigeminal (V2) in the pterygopalatine fossa. Postsynaptics hitchhike on branches of V2 to reach their targets
True
Study Notes
Functions and Anatomy of Nasal Cavity
- Paranasal sinuses function for mucous production, warming, humidifying, and filtering the air we breathe
- Mucosa of paranasal sinuses is innervated by the pterygopalatine ganglion
Nasal Cavity Structure
- The nasal cavity is divided into two parts by the nasal septum, which is formed by the vomer bone
- The vestibule is the anterior part of the nasal cavity, responsible for filtering, warming, and humidifying the air
- Conchae are found in the nasal cavity, curled, mucous membrane-covered shelves that warm, humidify, and filter the air
- Olfaction occurs in the olfactory epithelium, located in the superior part of the nasal cavity
- The anterior aspect of the nasal septum has an area where 5 arteries anastomose
- The inferior meatus drains the inferior concha, and the middle meatus is inferior to the superior concha, draining the posterior ethmoid air cells
Blood Supply and Innervation
- The anterosuperior blood supply of the nasal cavity comes primarily from the internal carotid artery
- The ophthalmic artery, a branch of the internal carotid artery, also supplies the nasal cavity
- The anterosuperior part of the nasal cavity is innervated by the anterior ethmoidal nerve
Paranasal Sinuses
- The sphenoidal sinus drains into the sphenoethmoidal recess
- The maxillary sinus, frontal sinus, and ethmoid sinus are all paranasal sinuses
Pterygopalatine Fossa
- The pterygopalatine fossa is a 'distribution center' for the nasal cavity, except for the olfactory epithelium
- The maxillary artery gives off branches to the nasal cavity and palate in the pterygopalatine fossa
- The superior cervical ganglion sends post-ganglionic sympathetic fibers to the pterygopalatine fossa
- The pterygopalatine ganglion is suspended from the maxillary division of the trigeminal nerve (V2) in the pterygopalatine fossa
Other
- The maxillary nerve (V2) gives GSA (general somatic afferent) branches to the face, except for the angle of the mandible
- The maxillary artery travels through the infraorbital canal after supplying muscles of mastication
- The paranasal sinuses are not found in the occipital bone
- The middle meatus does not contain the uncinate process
- The pharyngotympanic tube connects the middle ear to the nasopharynx
- The posteriorinferior portion of the nasal cavity receives blood supply from the superior labial branch of the facial artery
- The posteroinferior aspect of the nasal cavity is innervated by the posterior superior alveolar nerve
This quiz covers learning objectives related to the nasal cavity, paranasal sinuses, pterygopalatine fossa, and major arteries supplying the lateral wall and nasal septum. Test your knowledge on these anatomical structures and their innervations.
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