The supine position is a position of the body; lying down with the face up, as opposed to the prone position, which is face down. When used in surgical procedures, it allows access to the peritoneal, thoracic and pericardial regions; as well as the head, neck and extremities.[1]
Using terms defined in the anatomical position, the dorsal side is down, and the ventral side is up.
The supine position is also used for other examinations including an internal autopsy, palpitation and auscultation of the abdominal organs, and cardiovascular assessment.
In diagnostic imaging it is used to describe the position of the patient on the imaging device's table. Same applies to the position of the patient on a radiotherapy table.