Seizure

Convulsions. Epilepsy.

Sella Turcica

Bony structure at the base of the skull in which the pituitary gland rests.

Skinfold Thickness

A non-invasive measurement made with calipers from which the percentage body fat can be estimated.

Spasticity

Increased involuntary muscle contraction (the opposite of hypotonicity).

Speculum

An instrument for enlarging the opening of any canal or cavity in order to facilitate inspection of its interior.

Sphenoid Sinus

Either of two irregular cavities in the body of the sphenoid bone that communicate with the nasal cavities.

Spinal Fluid

Also known as cerebrospinal fluid. Clear colorless liquid secreted by the choroid plexus of the lateral, third, and fourth ventricles, and contained within the ventricular system of the brain and spinal cord and within the subarachnoid space.

SRIF

Somatotropin release inhibiting factor (same as GHRIH).

Stalk

A stem. Usually refers to the pituitary stalk that connects the pituitary gland to the hypothalamus.

Stent

Device used to maintain a bodily orifice or cavity during skin grafting, or to immobilize a skin graft after placement. Slender thread, rod, or catheter, lying within the space in the interior of a tubular structure, such as an artery or the intestine. Used to provide support during or after opening surgically, or to assure the opening of an intact but contracted lumen.

Stereotactic

Precise positioning in three dimensional space.

Stereotactic Radiosurgery

A radiation therapy technique that uses a large number of narrow, precisely aimed, highly focused beams of ionizing radiation. The stereotactic radiosurgery beams are aimed from many directions circling the head, and meet at a specific point.

Steroids

See glucocorticosteroids.

STH

Somatotropin (growth hormone, GH).

Stroke

The sudden development of localized disturbances in the nervous system, usually related to reduced blood in the brain.

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