Question

What are all 4 paranasal sinuses?

1) Frontal sinuses
2) Maxillary sinuses
3) Ethmoid sinuses
4) Sphenoid sinuses

Answer 1

Paranasal sinuses are hollow, air-filled spaces within the skull that serve to warm and humidify incoming air, produce mucus, and lighten the weight of the skull. The four paranasal sinuses are the frontal sinuses, maxillary sinuses, ethmoid sinuses, and sphenoid sinuses.

Step-by-step explanation:

Paranasal sinuses are hollow, air-filled spaces within the skull that serve to warm and humidify incoming air, produce mucus, and lighten the weight of the skull. There are four paranasal sinuses:

1. Frontal sinuses: Located in the frontal bone above the eyebrows, they are the most anterior sinuses.
2. Maxillary sinuses: Paired and located in the right and left maxillary bones below the orbits, they are the largest sinuses.
3. Ethmoid sinuses: Multiple small spaces located in the right and left sides of the ethmoid bone, between the medial wall of the orbit and the lateral wall of the upper nasal cavity.
4. Sphenoid sinuses: A single, midline sinus located within the body of the sphenoid bone, under the sella turcica. It is the most posterior sinus.