centriole


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centriole

 [sen´tre-ōl]
either of the two cylindrical organelles located in the centrosome and containing nine triplets of microtubules arrayed around their edges; centrioles migrate to opposite poles of the cell during cell division and serve to organize the spindles. They are capable of independent replication and of migrating to form basal bodies.
ring centriole a common misnomer for the anulus of the spermatozoon, which is not actually a centriole.

cen·tri·ole

(sen'trē-ōl),
Tubular structures, 150 nm by 300-500 nm, with a wall having nine triple microtubules, usually seen as paired organelles lying in the cytocentrum; centrioles may be multiple and numerous in some cells, such as the giant cells of bone marrow.
[G. kentron, a point, center]

centriole

/cen·tri·ole/ (sen´tre-ōl) either of the two cylindrical organelles located in the centrosome and containing nine triplets of microtubules arrayed around their edges; centrioles migrate to opposite poles of the cell during cell division and serve to organize the spindles. They are capable of independent replication and of migrating to form basal bodies.

centriole

(sĕn′trē-ōl′)
n.
One of two cylindrical cellular structures that are composed of nine triplet microtubules and form the asters during mitosis.

centriole

[sen′trē·ōl′]
Etymology: Gk, kentron
an intracellular organelle, usually a component of the centrosome. Often occurring in pairs, centrioles are associated with cell division and can be closely studied only with an electron microscope. They are tiny cylinders positioned at right angles to each other, with walls consisting of nine bundles of fine tubules, three tubules to a bundle. Numerous centrioles occur in some large cells, such as the giant cells in bone marrow. The precise function of centrioles is still a mystery, but they appear to aid in the formation of the spindle that develops during mitosis.

cen·tri·ole

(sen'trē-ōl)
Tubular structures usually seen as paired organelles lying in the cytocentrum; centrioles may be multiple and numerous in some cells, such as the giant cells of bone marrow.
[G. kentron, a point, center]

centriole

A short, hollow, cylindrical ORGANELLE consisting of nine sets of microtubules and usually occurring in pairs set at right angles to each other. Centrioles are responsible for the production of the spindle apparatus that appears just before the separation of the chromosomes into two sets prior to cell division.

centriole

One of the two rod-like bodies in cells forming the poles of the spindles during cell division.
Centrioleclick for a larger image
Fig. 97 Centriole . Structure and orientation.

centriole

one of a pair of small ORGANELLES lying at right angles to each other in an area known as the CENTROSOME, just outside the nucleus of lower plants and all animals (see Fig. 97 ). Centrioles are self-replicating, dividing into two during the ‘S’ phase of the INTERPHASE of the CELL CYCLE and then separating into two pairs, one pair migrating to each pole of the future mitotic spindle, from which an ASTER forms. The role of centrioles in nuclear division is unclear, since they are absent from most plant cells and laser-beam irradiation of centrioles has no effect on division.

centriole

either of the two cylindrical organelles located in the centrosome and containing nine triplets of microtubules arrayed around their edges; centrioles migrate to opposite poles of the cell during cell division and serve to organize the spindles. They are capable of independent replication and of migrating to form basal bodies.
References in periodicals archive ?
The sperm centriole is located in its neck within a 'black box', flanked by the segmental columns, just beneath the basal plate, proximal to its nucleus.
The centrosome specially the proximal centriole is considered to be the kinetic centre of sperm motility.
Central to the four mitochondria lies the centriole, which gives rise to the flagellum.
Keywords: Spider sperm ultrastructure, nucleus, implantation fossa, centriole, secretion
1-[micro]m long and originates from the basal body, which is formed by the single centriole.
The axoneme, which arises from the distal centriole, has the normal 9+2 arrangement of microtubules.
The mechanisms governing centriole formation constitute a long-standing question in cell biology.
Each cilium was associated with an accessory centriole and striated ciliary root.
Clam p53 and mortalin are often concentrated near the centriole or at the nuclear membrane and otherwise mirror those of the well-developed microtubular array (Fig.
During spermiogenesis the proximal centriole fuses laterally and orthogonally to the distal centriole to form the basal body, which produces an acentric flagellum (Fig.
In the thick region behind the nucleus, the centriole was perpendicular to the acrosome-nucleus axis and located in a shallow indentation of the nucleus (Fig.
Sperm autapomorphies for vestimentiferans are a thread-like acrosome vesicle (#2), a complex helical nucleus (#4), the absence of chromatin at the nuclear apex (#6), two mitochondria (#8), a single centriole (#9), and spermatozoa aggregated in sperm bundles (#12) (see Fig.