Coenocyte


Also found in: Dictionary, Medical, Wikipedia.

coenocyte

[′sē·nə‚sīt]
(biology)
A multinucleate mass of protoplasm formed by repeated nucleus divisions without cell fission.

Coenocyte

 

in animals, a type of tissue structure characterized by the absence of cell boundaries and the distribution of nuclei in a dense mass of cytoplasm. Examples of coenocytes include striated muscle fibers, the embryos of certain insects in the early stages of development, and certain protozoans, including many infusorians. Some tissues, for example, the epithelial intestinal lining of many mollusks and insects, have alternating cellular and coenocytic structures at various stages of digestion. A coenocyte may be formed by cell fusion or by the multiplication of nuclei without subsequent plasmotomy or cytotomy.

In plants the polynuclear protoplast of organisms having no cell structure, for example, Caulerpa, is referred to as either a coenocyte or syncytium. In multicellular plants the term “coenocyte” refers to the protoplasmic contents (including nuclei) of fused cells, for example, jointed lactiferous vessels, as well as to the aggregate of protoplasts connected by protoplasmic threads (plasmodesmata).

Mentioned in ?
References in periodicals archive ?
Caption: Figure 2: Kaplan-Meier survival curves depicting OS according to the ascites coenocyte level.
Lipids originating from the lamellar bodies in the stratum gradulosum, secrete into the epidermis, acting in a similar way to waterproof mortar between the coenocytes (flattered cells) of the horny layer This chemical and PH balance maintains the thickness of the epidermis (Cork, M.J et al 2009).
During both processes, MMCs fail to undergo cytokinesis, and the coenocytes that form are already either unreduced binucleate (Antennaria-type diplosporic) or reduced tetranucleate (tetrasporic) embryo sacs.