Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «S»:
Sigmoidoscopy, flexible: Inspection of the inside of the rectum and lower part of the colon using a thin flexible lighted tube (a flexible sigmoidoscope). This procedure may be done to find the cause of diarrhea, constipation, abdominal pain, intestinal bleeding or look for polyps or cancer. With f...
Sign: Any objective evidence of disease. Gross blood in the stool is a sign of disease. It can be recognized by the patient, doctor, nurse, or others. In contrast, a symptom is, by its nature, subjective. Abdominal pain is a symptom. It is something only the patient can know....
Sign language: A language
that employs signs made with the hands and other movements, including facial
expressions and postures of the body, used primarily by people who are deaf.
There are many different sign languages as, for example, British and American sign languages. British sign language (...
Sign of pregnancy
Sign of pregnancy: See entry to: Pregnancy symptom....
Sign, Babinski: A neurologic reflex that constitutes an
important medical examination based upon what the big toe does when
the sole of the foot is stroked. If the big toe goes up, that may
well mean trouble.
The Babinski sign is obtained by stimulating the external portion
(the outside) of the ...
Sign, Gottron: A scaly, patchy redness over
the knuckles seen in patients with dermatomyositis, an inflammatory muscle disorder.
Sign, Kernig: A clinical hallmark of
of the meninges, the membranes covering the brain and spinal cord.
The test for Kernig sign is done by having the
person lie supine (flat on the back), flex the thigh so
that it is at a right angle to the trunk, and completely extend ...
Sign, Lhermitte: Sudden transient electric-like shocks extending down the spine triggered by flexing the head forward. Due to a disorder such as compression of the cervical spine (the portion of the spinal cord within the neck).
One patient who experienced Lhermitte sign wrote that: "Looking down to...
Sign, Macewen: A sign to
detect hydrocephalus and brain abscess. Percussion
(tapping) on the skull at a particular spot (near the
junction of the frontal, temporal and parietal bones)
yields an unusually resonant sound in the presence of
hydrocephalus or a brain abscess.
Named for Sir Will...
Sign, Tinel's: An examination test that is used by doctors to detect an irritated nerve. Tinel's sign is performed by lightly banging (percussing) over the nerve to elicit a sensation of tingling or "pins and needles" in the distribution of the nerve.
For example, in a person with carpal tunnel synd...
Sign, toe: An important neurologic test based upon what the
toes do when the sole of the foot is stimulated. If the big toe goes
up, that may mean trouble.
The toe sign, also called the Babinski reflex, is obtained by
stimulating the external portion (the outside) of the sole. The
Signal transduction: A basic
process in molecular cell biology involving the conversion of a signal from outside the cell to a functional change within the cell.
A signal (such as a hormone or neurotransmitter) interacts with a receptor on the cell surface; this interaction causes a change in a se...
Signal transduction pathway
Signal transduction pathway: The course by which a signal from outside a cell is converted to a functional change within the cell....
Signature: 1) That part of the prescription that contains
the doctor's directions to the patient. For example, the signature
might say "take twice daily with food". Also known as the sig.. 2)
The outward appearance of a natural object, which was once taken as a
token of its special properties. ...
Sikimitoxin: Poisonous substance found in the Japanese star anise, which is also called sikimi....