Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «C»:
Ciguatoxin: A seafood toxin that is acquired by eating fish that have consumed toxic single-celled marine organisms called dinoflagellates or fish that have consumed other fish that have become toxic. When someone eats these fish, they suffer seafood poisoning. Food poisoning from ciguatoxin is call...
Cilia: The fine hairlike projections from certain cells such as those in the respiratory tract that sweep in unison and help to sweep away fluids and particles. Some single-celled organisms use the rhythmical motion of cilia for locomotion.
Cilia is the plural of cilium, a Latin word referring to t...
Ciliary body: Part of the eye, the ciliary body is
a thin vascular (blood vessel-filled) middle layer of the eye that is
situated between the sclera (the white of the eye) and the retina
(the nerve layer that lines the back of the eye, senses light, and
creates impulses that travel through the o...
Ciliary body melanoma
Ciliary body melanoma: See: Intraocular melanoma....
Ciliary muscle: One of the muscles that
relax the zonules to enable the lens to change shape for focusing.
The zonules are fibers that hold the lens suspended in position and enable it to change shape during accommodation....
Ciliary neuralgia: A distinctive syndrome of headaches, better known today as cluster headache.
There are two main clinical patterns of cluster headache -- the episodic and the chronic:
Episodic: This is the most common pattern of cluster headache. It
is characterized by 1-3 short attacks of pain ...
Cilium: A fine hairlike projection from a cell such as those in the respiratory tract. Cilia can help to sweep away fluids and particles. Some single-celled organisms use the rhythmical motion of cilia for locomotion.
Cilium is Latin. It referred to the edge of the eyelid and, much later, to the ey...
Cinacalcet: A drug that acts as a calcimimetic and that is marketed under the trade name Sensipar.
For more information, see: Calcimimetic....
Refers to events occurring within a 24-hour period, in the span of a full (24-hour) day, as in a circadian rhythm. Circadian rhythmicity is a fundamental property possessed by all organisms. These rhythms are driven by an internal time-keeping system: a clock. Changes in the external envi...
Circinate balanitis:A form of skin inflammation around the penis in males with Reiter's syndrome. The skin around the shaft and tip (glans) penis can become inflamed and scale. This inflammation around the penis can be helped by cortisone creams (such as TOPICORT).
Reiter's syndrome is a systemic r...
Circle of Willis
Circle of Willis: An arterial circle at the base of the brain that is of critical importance. The circle of Willis receives all the blood that is pumped up the two internal carotid arteries that come up the front of the neck and that is pumped from the basilar artery formed by the union of the two v...
Circular breathing: Inhaling through the nose and inflating the cheeks and neck with air at the same time.
Some saxophone players do circular breathing; this may not be a safe practice since it may reduce blood flow to the brain....
Circulation: The movement of fluid in a regular or
circuitous course. Although the noun "circulation" does not necessarily refer to
the circulation of the blood, for all practical purposes today it does. Heart failure is
an example of a problem with the circulation....
Circulation, fetal: The blood circulation in the fetus
(the unborn baby). Before birth, the blood from the heart that is destined (in the
pulmonary artery) for the lungs is shunted away from the lungs and returned to the
greatest of arteries (the aorta). The shunt is through a short vessel called th...
Circulatory: Having to do with the circulation, the
movement of fluid in a regular or circuitous course. Although the adjective
"circulatory" need not necessarily refer to the circulation of the blood, for
all practical purposes today it does. A circulatory problem is taken usually to be a