Bag, air
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  Bag, air

Bag, air

   Popular name for the amniotic sac together with the amniotic fluid within it. The amniotic sac is formed by the amnion within the uterus and encloses the fetus. This sac bursts normally during the birthing process, releasing the amniotic fluid. Also known as the amniotic sac.


A thin membrane surrounding the fetus during pregnancy. The amnion is the inner of the two fetal membranes (the chorion is the outer one). It contains the amniotic fluid.

The uterus is a hollow, pear-shaped organ located in a woman's lower abdomen, between the bladder and the rectum, that sheds its lining each month during menstruation and in which a fertilized egg (ovum) becomes implanted and the fetus develops.

The stage of human development from 10 weeks' gestation until birth.

"Pouch; a bag-like structure."



The science and study of bacteria and their relation to medicine and to other areas such as agriculture (e.g., farm animals) and industry. Bacteria are single-celled microorganisms which can live as independent organisms or, dependently, as parasites. Among the better known bacteria are strep, staph, and the agents of tuberculosis and leprosy.

See: Phage.

The singular of bacteria.

Bad air
"Any air considered noxious. Today, air filled with tobacco smoke might be considered ""bad air."" So might air contaminated by the emissions of power plants. In the past, bad air was termed a miasma, a poisonous vapor or mist believed to be made up of particles from decomposing material which could cause disease and which could be identified by its foul smell. See: Miasma."

BAEP (brainstem auditory evoked potentials)
See: ABR test.

Bag, air

Baker cyst
A swelling in the space behind the knee (the popliteal space) composed of a membrane-lined sac filled with synovial fluid that has escaped from the joint. Named after the British surgeon William Morrant Baker (1839-1896). Also called a synovial cyst of the popliteal space.

A biological system that enables us to know where our bodies are in the environment and to maintain a desired position. Normal balance depends on information from the inner ear, other senses (such as sight and touch) and muscle movement.

Balance, acid-base
Acid-base balance refers to the mechanisms the body uses to keep its fluids close to neutral pH (that is, neither basic nor acidic) so that the body can function normally.

Balance, sense of
"Our sense of balance is regulated by a complex interaction of the following parts of the nervous system: The inner ears (also called the labyrinth) monitor the directions of motion, such as turning or forward-backward, side-to-side, and up-and-down motions.;The eyes observe where the body is in space (i.e., upside down, right side up, etc.) and also the directions of motion.; Skin pressure receptors such as those located in the feet and seat sense what part of the body is down and touching the ground.; Muscle and joint sensory receptors report what parts of the body are moving.;The central nervous system (the brain and spinal cord) processes all the bits of information from the four other systems to make some coordinated sense out of it all."

Inflammation of the rounded head (the glans) of the penis. Inflammation of the foreskin is called posthitis. In the uncircumcised male, balanitis and posthitis generally occur together as balanoposthitis: inflammation of both the glans and foreskin.

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