Supraglottis
The upper part of the larynx, including the epiglottis; the area above the vocal cords.
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- Supraspinatus muscle
The muscle that elevates the arm and moves it away from the body. The tendon of the supraspinatus muscle is one of four tendons that stabilize the shoulder joint and constitute the rotator cuff.
- Suprasternal notch
The V-shaped notch at the top of the breastbone (sternum).
- Supraventricular tachycardia
Abbreviated SVT. A regular, abnormally fast heart beat (tachycardia) caused by rapid firing of electrical impulses from a focus above the atrioventricular node (A-V node) in the heart. Called supraventricular because the tachycardia originates above the ventricles of the heart.
- Surface EMG
“There is in fact almost no literature to support the use of SEMG in the clinical diagnosis and management of nerve or muscle disease.” Still, the SEMG may prove of value in the future in helping to monitor the progression of disorders of nerves and muscles.
- Surfactant
A fluid secreted by the cells of the alveoli (the tiny air sacs in the lungs) that serves to reduce the surface tension of pulmonary fluids; surfactant contributes to the elastic properties of pulmonary tissue, preventing the alveoli from collapsing.