The distal end of the common bile duct contains a sphincter that controls the bile entering into the duodenum.  This sphincter is termed the:

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

The anatomy pointed out in the figure below is the:            

In a typically shaped head, the petrous pyramids project anteriorly and medially at what angle?

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

Where is the cassette centered for the parietoacanthial (Waters method) projection of the sinuses?

The small bone situated at the base of the tongue is the:

The number 4 on the image below corresponds to what part of the colon?                         

For an SMV projection of the cranial base, the CR should always be perpendicular to the:

Where should the superior edge of the cassette be placed for an AP projection of the thoracic vertebrae?