cilium

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Related to ciliated: Ciliophora

cilium

1. any of the short thread-like projections on the surface of a cell, organism, etc., whose rhythmic beating causes movement of the organism or of the surrounding fluid
2. the technical name for eyelash

Cilium

 

a slender filamentous or setaceous process found on cells that is capable of rhythmic movements. Among Protozoa, cilia are characteristic of infusorians. In some lower multicellular animals, such as turbellarians, cilia are found on all external covering elements (integumentary epithelium). The larvae of most coelenterates and sponges have a ciliated covering. In vertebrates, including humans, only a few specialized cells have cilia. For example, in man cilia cover the epithelium of the respiratory tract, the eustachian tubes, the vasa deferentia, the oviducts, and the uterus. Locomotor activity of the cilia ensures movement of the cell in a fluid medium; a ciliated cell that is fixed to a substrate produces currents of fluid in the surrounding medium.

The average cilium has a length of 5–15 microns and a diameter of 0.1–0.6 microns. The number of cilia on one cell ranges from ten to 22 in man to 2,500–15,000 in infusorians. The ultra-structures of cilia and flagella are identical. Externally cilia are covered with a three-layered membrane that becomes the surface membrane of the cell. In the center are two central tubular fibrils, which extend the length of the cilia, and nine peripheral fibrils, each of which is double. In the superficial layers of the cell cytoplasm, each cilium originates from the basal body, which has a structure similar to that of the cilium but lacks the central fibrils. The peripheral fibrils cause movement of the cilium, and the central ones apparently play a supportive role and possibly serve to conduct excitation.

IU. I. POLIANSKII

References in periodicals archive ?
7 mm; leaflets 2 pairs, papyraceous, abaxial surface pubescent and adaxial surface puberulent, the distal 30-55 x 15-28 mm, the proximal 14-43 x 7-24 mm, ellipticoblanceolate, lanceolate-elliptic, obovate, ovate, venation brochidodromous, nervures 7-13 pairs, apex emarginate, short mucronate and obtuse, base cuneate, oblique, obtuse, subcordate, margin revolute, ciliated.
A study on the differential diagnosis of ciliated epithelial cells from Lophomonas blattarum in bronchoalveolar lavage fluid (in Chinese).
When ciliated cells are healthy and balanced, they cover viruses from the body with mucus.
However, if these ciliated cells are not working normally, then this will provide possibility to viruses to attack the cells and increase.
These pigment patches appear to be groups of pigment-containing cells that extend into the episphere from the ciliated band, are irregular or stellate in shape (Fig.
Non ciliated receptors may have a chemo-mechanoreceptor involvement in site selection for feeding and, possibly, in mating during cross-fertilization.
We determined that hydrochar can be consumed by ciliated zooplankton (Brachionus plicatilis) as well as the larvae of the marine sea urchin (Lytechinus variegatus).
In the spawning season some post-ovulatory follicles had an opening to the ciliated gonoduct through which mature oocytes had been released (Fig.
A third notable finding was a more concentrated attachment of H7N9 viruses in ciliated cells of the nasal concha, trachea, and bronchi, suggesting the potential for efficient transmission among humans.
Gestational SS exposure impairs the development of Clara and goblet cells but not ciliated epithelium cells.
Histological sections revealed fibrocollagenous cyst walls bilaterally, lined by pseudostratified ciliated columnar epithelium with areas of squamous metaplasia.
Responsible protective mechanisms in the respiratory tract include the cough reflex, ciliated respiratory epithelium, and the immunoglobulin secretory IgA.