Final answer:
In a PA Axial sinuses view, the most important sinuses are the frontal and anterior ethmoid sinuses. The frontal sinus is located in the frontal bone above the eyebrows and is the most anterior paranasal sinus. The anterior ethmoid sinuses consist of multiple air cells within the ethmoid bone.
Step-by-step explanation:
When performing a PA Axial sinuses view, which is a radiographic view of the sinuses, the most important sinuses visualized are the frontal and anterior ethmoid sinuses. The frontal sinus is the most anterior paranasal sinus and is located in the frontal bone above the eyebrows. The anterior ethmoid sinuses, composed of multiple small spaces called ethmoid air cells, are located on the sides of the ethmoid bone between the upper nasal cavity and medial orbit.
In the context of sinus imaging and sinusitis, these sinuses are critical for examination. The maxillary sinuses, although the largest, are not the primary focus of a PA Axial view, which is intended to visualize and assess the sinuses located more anteriorly.