Ciliary muscle: A circular muscle that relaxes or tightens 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
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 around the eyes per day, with these attacks […]
Cinacalcet: A drug that acts as a calcimimetic and that is marketed under the trade name Sensipar. For more information, see: Calcimimetic.
Circadian: Refers to events occurring within the span of a full 24-hour day, as in a circadian clock.
- Circinate balanitis
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 rheumatic disease, systemic since it can affect the […]
- Circle of Willis
Circle of Willis: A critical arterial circle at the base of the brain. 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. All the principal arteries that supply the two halves of the brain (hemispheres) branch off from the […]