Podcast
Questions and Answers
What is the function of the paranasal sinuses?
What is the function of the paranasal sinuses?
- To produce mucus
- To transmit electrical signals
- To regulate body temperature
- To provide vocal resonance and lighten the skull bones (correct)
What innervates the mucosa of the paranasal sinuses?
What innervates the mucosa of the paranasal sinuses?
- Trigeminal nerve branches (correct)
- Vagus nerve branches
- Accessory nerve branches
- Facial nerve branches
Which bone divides the nasal cavity into two parts?
Which bone divides the nasal cavity into two parts?
- Sphenoid bone/ Maxillary bone
- Ethmoid bone/Vomer (correct)
- Maxillary bone/ Temporal bone
- Frontal bone/ Ethmoid bone
What is the function of the vestibule in the nasal cavity?
What is the function of the vestibule in the nasal cavity?
Where are the conchae found in the nasal cavity?
Where are the conchae found in the nasal cavity?
Which area of the nasal cavity is involved in olfaction?
Which area of the nasal cavity is involved in olfaction?
Which area on the anterior aspect of the nasal septum is where 5 arteries anastomose?
Which area on the anterior aspect of the nasal septum is where 5 arteries anastomose?
Which meatus is inferior to the superior concha and drains the posterior ethmoid air cells?
Which meatus is inferior to the superior concha and drains the posterior ethmoid air cells?
What structure drains the inferior meatus?
What structure drains the inferior meatus?
From which artery does the anterosuperior blood supply of the nasal cavity primarily come?
From which artery does the anterosuperior blood supply of the nasal cavity primarily come?
Which nerve provides innervation to the anterosuperior part of the nasal cavity?
Which nerve provides innervation to the anterosuperior part of the nasal cavity?
What drains into the sphenoidal sinus?
What drains into the sphenoidal sinus?
Which artery does NOT contribute to the blood supply in Kiesselbach’s area?
Which artery does NOT contribute to the blood supply in Kiesselbach’s area?
Which of the following is the pterygopalatine fossa not a 'distribution center' for?
Which of the following is the pterygopalatine fossa not a 'distribution center' for?
Where does the maxillary artery give off branches to in the pterygopalatine fossa?
Where does the maxillary artery give off branches to in the pterygopalatine fossa?
What type of fibers originate from the Superior Cervical Ganglion into the pterygopalatine fossa?
What type of fibers originate from the Superior Cervical Ganglion into the pterygopalatine fossa?
Which part of the face does the Maxillary nerve not give GSA branches to?
Which part of the face does the Maxillary nerve not give GSA branches to?
Where does the Maxillary artery travel after supplying muscles of mastication?
Where does the Maxillary artery travel after supplying muscles of mastication?
Which of the following bones is the paranasal sinus not found in
Which of the following bones is the paranasal sinus not found in
Which of the following is not found in the middle meatus?
Which of the following is not found in the middle meatus?
What drains in the sphenoethmoidal recess?
What drains in the sphenoethmoidal recess?
What is the pharyngotympanic tube?
What is the pharyngotympanic tube?
What is the blood supply for the posteroinferior portion of the nasal cavity?
What is the blood supply for the posteroinferior portion of the nasal cavity?
What innervates the posteroinferior aspect of the nasal cavity?
What innervates the posteroinferior aspect of the nasal cavity?
What are the boundaries of the pterygopalatine fossa?
What are the boundaries of the pterygopalatine fossa?
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
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
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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
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