anulus


anulus

 [an´u-lus] (pl. a´nuli) (L.) a small ring or encircling structure; also spelled annulus.anulus fibro´sus 1. fibrous ring of heart; any of four dense fibrous rings, one of which surrounds each of the major cardiac orifices.2. fibrous ring of intervertebral disk; the circumferential ringlike portion of an intervertebral disk.anulus of spermatozoon a dark ringlike structure at the posterior end of the middle piece of a spermatozoon. Called also ring centriole.

ring

(ring), [TA] 1. A circular band surrounding a wide central opening; an anular or circular structure surrounding an opening or level area. Synonym(s): anulus [TA]2. The closed (that is, endless) chain of atoms in a cyclic compound; commonly used for "cyclic" or "cycle." 3. A marginal growth on the upper surface of a broth culture of bacteria, adhering to the sides of the test tube in the form of a circle. Synonym(s): anulus [A.S. hring]

ring

(ring) [TA] 1. Anular or circular structure surrounding an opening or level area.
Synonym(s): anulus [TA] . 2. anatomy Anulus. 3. The closed chain of atoms in a cyclic compound; commonly used for "cyclic" or "cycle." 4. A marginal growth on the upper surface of a broth culture of bacteria, adhering to the sides of the test tube in the form of a circle.