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refers to a force whose vector is parallel to the cross section of a structure. In the spine this would be a force that is parallel to a joints cross section that acts to encourage a dislocation of the joint.

Short Sit

The short sit position is position assumed when sitting in a chair or on a stool with hip and knee joints at 90 degrees and feet flat on the floor.

Short Sitting

The short sit position is position assumed when sitting in a chair or on a stool with hip and knee joints at 90 degrees and feet flat on the floor.

shunt

Hydrocephalus is commonly treated with a shunt, a tube typically containing one or more valves to manage the amount of cerebrospinal fluid (CSF) it removes from the ventricles or other fluid spaces in or about the central nervous system. The shunt is usually described by the space its inlet(s) drain (e.g., ventricular) and the space into which it deposits the CSF (e.g., peritoneal) to treat the hydrocephalus (e.g., ventricular-peritoneal, ventriculo-peritoneal shunt or VP shunt).

SIADH

Syndrome of inappropriate antidiuretic hormone (secretion) – a condition where the amount of circulating antiduretic hormone is too high (typically due to its over secretion by the posterior pituitary gland) leading to inappropriate retention of fluids as reflected by hyponatremia.

SIDS

Sudden Infant Death Syndrome – Sudden death in an infant with no preceding risks factors for death and no explanation fo death at autopsy.

Sincipital

From term sinciput – latin half head. Used to refer to upper half of cranium, commonly the anterior portion of including the forehead.

siRNA

Small interfering RNA – AKA short interfering or silencing RNA. It is a double stranded RNA that participates in the RNAi pathway to regulate gene expression.

Slip ring technology

Slip ring technology. In a CT scanner the X ray detector is rotating rapidly, the technological challenge is to permit continuous transmission of this data to the static data recording software. This tranmission is achived through “slip rings”, sliding electrical contacts between the detector and the image processing unit.

SOMI

Sterno-Occipital-Mandibular-Immobilizer.  A brace used to maintain the head, neck and trunk in a proscribed alignment.