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 the edge of the eyelid and, much later, to the eyelashes. Cilia came to be known fine hairlike projections from cells.
- Ciliary body
Ciliary body: Part of the eye, the ciliary body is a circular structure just behind the iris composed of the ciliary muscle and ciliary processes which attach to the lens. The ciliary processes secrete the aqueous fluid, and the ciliary muscle modifies focus by changing the shape of the lens The ciliary body is part […]
- Ciliary muscle
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.