Medical Glossary

Sagittal

A plane or section that divides a structure into right and left portions.

Scoliosis

A side to side curvature of the vertebral column.

Sensory

Pertaining to or conveying sensation (i.e., pain, touch, temperature).

Sheath

A covering structure, usually elongated.

Shunt

Passage constructed to divert flow from a normal route to another.

Skull Series

A group of x-rays taken of the skull from various positions.

Sleep Apnea

To stop breathing for brief periods while sleeping.

SM

Syringomyelia

Somatosensory Evoked Potentials

A test of the brain using electrical stimulation to look at reactions of body sensations relating to the bodys superficial and deep parts as contrasted to specialized senses such as sight. Responses...

Spasticity

Stiffness or position that is difficult to release.

Spina Bifida

Failure of the spine to close properly during the first month of pregnancy. In severe cases, the spinal cord protrudes through the back and may be covered by skin or a thin membrane.

Stenosis

A constriction or narrowing of a passage.

Stent

A material used to hold tissues in place or provide a support for a graft or a suturing of two ends of a tissue until healing takes place.

Strabismus

Disorder in which the two eyes cannot be directed at the same object; when one eye fixes upon a point (sees an object), the other eye deviates to some other point; vision in the deviated eye is...

Stridor

A harsh sound made during respiration. It is high pitched and sounds like the howling of the wind. It is due to constriction of the air passages.

Subarachanoid Space

The space within the meninges between the arachnoid mater and the pia mater.

Subcutaneous Tissue

Tissue beneath the skin.

Suboccipital

Area beneath the back of the head; below the occipital bone.

Subperiosteal

Beneath the periosteum (the membrane covering of the bones).

Sulcus

A furrow, fissure or depression, especially of the brain. There are many named in the anatomy of the brain.

Supine

Lying on the back - a position.

Sylivan Aqueduct

A narrow canal from the third to the fourth ventricle.

Syncope

A partial or complete temporary cessation of breathing and circulation due to cerebellar ischemia. It is characterized by sudden pallor, coldness of the skin and partial or complete unconsciousness.

Syringo

Relationship to a tube or fistula (abnormal tube like passage from a normal tube or cavity to a free surface or cavity.

Syringocoele or -cele

The central cavity or canal of the spinal cord continuous with the 4th ventricle of the brain stem; the cavity containing protrusion of the spinal cord in spina bifida.

Syringomyelia (SM)

A chronic progressive disease of the spinal cord characterized by the development of fluid-filled cavities of surrounding tissues. Cavitation can occur in any area of the spinal cord. It can involve...

Syringotomy

An operation to excise a fistula (an abnormal tube-like passage).

Syrinx

A pipe, tube, or cavity.
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