Final answer:
The uppermost section located just posterior to the nasal cavity is the superior nasal concha.
Step-by-step explanation:
The uppermost section located just posterior to the nasal cavity is the superior nasal concha. The nasal cavity is divided into left and right sections by the nasal septum, and the upper part of the septum is formed by the perpendicular plate of the ethmoid bone. The superior nasal concha, along with the middle and inferior nasal conchae, increase the surface area of the nasal cavity and help to clean, warm, and humidify the inhaled air.