centriole



centriole defined in 1951 year

centriole - centriole;
centriole - Minute rod-shaped body, 300-500 nm long and 150 nm diameter, present in many resting cells, just outside the nuclear membrane. Cylindrical, containing nine short, parallel, peripheral fibrils, each fibril consisting of one to three sub-fibrils. Doubles during or after mitosis, and at the beginning of the next mitosis the two centrioles move apart and form the poles of the spindle, and the centres of the asters when present. Absent in higher plants. Similar structures, known variously as basal bodies, kinetoplasts, kinetosomes, blepharoplasts, are connected to axial filaments of flagella and cilia, e.g. in sperm, zoospores.

near centriole in Knolik


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letter "C"
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