Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «S»:
Subarachnoid hemorrhage: Bleeding within the head into the space between two membranes that surround the brain. The bleeding is beneath the arachnoid membrane and just above the pia mater. (The arachnoid is the middle of three membranes around the brain while the pia mater is the innermost one.)
Subclavian: Under the clavicle (the collar bone), as the subclavian artery or the subclavian vein....
Subclavian steal: The symptoms of cerebral vascular insufficiency (not enough blood to the brain) when the patient exercises an arm, due to obstruction of the subclavian artery before the origin (the takeoff) of the vertebral artery. Exercising the arm causes the blood flow to reverse and the subcla...
Subclinical disease: An illness that stays below the
surface of clinical detection. A subclinical disease has no
recognizable clinical findings. It is distinct from a clinical
disease, which has signs and symptoms that can be recognized. Many
diseases, including diabetes, hypothyroidism, and rhe...
Subconjunctival hemorrhage: A very common cause of a painless bloody eye usually first noticed by somebody else or by the person with it when they look in the mirror. The bleeding results from a break in a small blood vessel in the sclera, the white of the eye. This releases a tiny amount (less than...
Subcu: Abbreviation for subcutaneous.
Subcutaneous means under the skin. It implies just under the
With a subcutaneous injection, a needle is inserted just under the
skin. A drug (for example, insulin) can then be delivered into the
subcutaneous tissues. After the injection, the drug mov...
Subcutaneous: Under the skin. "Subcutaneous" implies just under the skin.
With a subcutaneous injection, a needle is inserted just under the skin. A drug (for example, insulin) can then be delivered into the subcutaneous tissues. After the injection, the drug moves into small blood vessels and the...
Subcutaneous hematoma: A bruise....
Subdeltoid: Beneath the deltoid, the large muscle that stretches from the clavicle (collarbone) to the humerus (the long bone in the upper arm) and so covers the shoulder....
Subdural: Below the dura, the outermost, toughest, and most fibrous of the three membranes (meninges) covering the brain and the spinal cord. An subdural hematoma is a collection of blood beneath the dura....
Subdural hematoma: Bleeding into the space between the dura (the brain cover) and the brain itself. This space is called the subdural space. If the hematoma puts increased pressure on the brain, neurological abnormalities including slurred speech, impaired gait, and dizziness may result and progress...
Subglottis: The lower part of the larynx just
below the vocal cords down to the top of the trachea, which takes air to the lungs....
Subjacent: Just beneath or underneath. The opposite of subjacent is superjacent. Other related terms include adjacent and circumjacent. From sub-, under + the Latin jacere, to lie = to lie under....
Subject: As a noun:
1. A branch of learning that forms a course of study. In medical school, one of the subjects traditionally studied in the first year is anatomy.
2. A matter that is studied or otherwise considered. Death is a subject often avoided by doctors in talking with patients.
3. The obje...
Sublingual: Underneath the tongue. A sublingual
medication is a type of lozenge put under the
tongue where it dissolves and is absorbed. The sublingual gland is a salivary gland under the tongue. See also: Lingual....