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Paranasal Sinuses Anatomy and Function

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Questions and Answers

How many sinuses are named according to the bone in which they are located?

4 (correct)

Which of the following is not a paranasal sinus?

Temporal (correct)

Sphenoid

Frontal

Maxillary

Paranasal sinuses are lined with ciliated pseudostratified epithelium interspersed with mucus secreting goblet cells.

True

What is the main function of paranasal sinuses?

They are involved in lightening the weight of the head, supporting the immune defense of the nasal cavity, humidifying inspired air, and increasing resonance of the voice. Signup and view all the answers

How are paranasal sinuses formed?

During development, they are formed by the nasal cavity eroding the surrounding bones. Signup and view all the answers

Where are the openings to the paranasal sinuses located?

They can be found on the roof and lateral nasal walls. Signup and view all the answers

What is the drainage route for the frontal sinus?

It drains via the frontonasal duct, which opens out at the hiatus semilunaris within the middle meatus of the nasal cavity. Signup and view all the answers

What is the innervation of the frontal sinus?

It is supplied by the supraorbital nerve (branch of the ophthalmic). Signup and view all the answers

What is the blood supply of the frontal sinus?

It is supplied by the anterior ethmoidal artery (branch of the internal carotid). Signup and view all the answers

Where does the sphenoid sinus open into?

It opens into the nasal cavity in an area superior/posterior to the superior concha, known as the sphen-ethmoidal recess. Signup and view all the answers

What is the innervation of the sphenoid sinus?

It is innervated by the posterior ethmoid nerve (branch of the ophthalmic) and branches of the maxillary nerve. Signup and view all the answers

What is the blood supply of the sphenoid sinus?

It receives blood via the pharyngeal branches of the maxillary arteries. Signup and view all the answers

Study Notes

Paranasal Sinuses

Sinuses are air-filled extensions of the nasal cavity
4 sinuses named according to the bone in which they are located:
- Maxillary
- Frontal
- Sphenoid
- Ethmoid
Each sinus is lined with ciliated pseudostratified epithelium interspersed with mucus-secreting goblet cells

Function

Lightening the weight of the head
Supporting the immune defense of the nasal cavity
Humidifying inspired air
Increasing resonance of the voice

Formation

All sinuses develop back into the nasal cavity eroding the surrounding bones.
Openings to the paranasal sinuses can be found on the roof & lateral nasal walls

Frontal Sinus

Drainage via the frontonasal duct
Opens out at the hiatus semilunaris within the middle meatus of the nasal cavity
Innervation - Supraorbital nerve (branch of the ophthalmic)
Blood supply - Anterior ethmoid artery (branch of internal carotid)

Sphenoid Sinus

Opens into nasal cavity in an area superior / posterior to the superior concha known as the spheno-ethmoidal recess
Innervation - Posterior ethmoid nerve (branch of the ophthalmic)
Blood supply - via the pharyngeal branches of the maxillary arteries

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Description

Explore the anatomy and function of paranasal sinuses in this detailed quiz. Learn about the four types of sinuses, their formation, and their critical roles in respiratory health and vocal resonance. Test your knowledge on the drainage and innervation of specific sinuses like the frontal and sphenoid.