Supines

Supine is an adjective describing a body position in which a person lies flat on the back, with the face directed upward. In anatomy and medicine it is also used as a noun referring to a person in this posture, often phrased as “the supine.” It is opposed to prone, where a person lies face down. The term derives from Latin supinus, meaning bent backward.

In clinical practice the supine position is commonly used for examination, routine monitoring, many surgical procedures, and for imaging studies such as chest radiographs, abdominal ultrasound, CT, and MRI, when access to the front of the body is required. Some procedures require alternative positions, such as lateral decubitus or Trendelenburg, but many standard assessments begin with the patient supine.

Physiological and practical considerations: lying supine can influence airway management and the risk of aspiration in sedated or unconscious patients. It also affects circulatory dynamics, intracranial pressure, and venous return, depending on context, body habitus, and comorbidities. Proper support and alignment are important to prevent nerve or pressure injuries, and immobilization may be necessary during surgery or imaging.

The plural form “supines” is used when referring to multiple instances of this posture or to groups described as supine in clinical documentation. In linguistic contexts, supine is also a grammatical term in some languages, but this usage is separate from the anatomical sense.

See also: prone, dorsal recumbent, recumbent, Trendelenburg.