Final answer:
The sphenoid sinus, located within the body of the sphenoid bone and the most posterior of the paranasal sinuses, is the correct answer. It's found just anterior and inferior to the sella turcica, with other sinuses positioned in the frontal, maxillary, and ethmoid bones.
Step-by-step explanation:
The paranasal sinuses are hollow, air-filled spaces within the skull that are named after the skull bones they occupy. Among these, the sphenoid sinus is located within the body of the sphenoid bone and is the most posterior of the paranasal sinuses.
This particular sinus is found just anterior and inferior to the sella turcica. The other sinuses include the frontal sinus located in the frontal bone above the eyebrows, the maxillary sinuses in the maxillary bones below the orbits, which are the largest and commonly affected during sinus infections, and the ethmoid air cells which are multiple small spaces in the ethmoid bone, between the medial wall of the orbit and lateral wall of the upper nasal cavity.