Which reference line is positioned perpendicular to the angled cassette for the PA axial (Caldwell method) projection of the sinuses?

The combining form cholecyst(o)- means:

Functions of the stomach include: 1. storage of food; 2. absorption of food products; 3. food is chemically broken down

The anatomy pointed out in the figure below is the:            

Which line is placed perpendicular to the plane of the cassette for the PA projection of the sinuses?

The area identified in the figure below is the:            

How much lower should the cassette be positioned when the upright position is used for projections of the stomach?

The base of the anterior portion of the occipital bone contains two large openings that allow blood vessels and nerves to pass through.  These two openings are called the:

            The bone indicated in the figure above is the:

            The part identified on the vertebrae above is the: