- telolecithal ovum
- بيضة قطبية المح
English-Arabic Medical Dictionary. 2013.
telolecithal ovum
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Telolecithal — ( Greek telo = end, lekithos = yolk) refers to the uneven distribution of yolk in the cytoplasm of ovums of found in birds, reptiles, and fish. The yolk is concentrated at one pole of the egg separate from the developing embryo.This type of egg… … Wikipedia
Ovum — An ovum is an egg that exists in the ovary of the female. This egg is called the female "gamete" or sex cell. It combines with the male gamete, called a sperm, to form a zygote. This formation process is called… … Medical dictionary
telolecithal — Denoting an ovum in which a large amount of deuteroplasm or yolk accumulates at the vegetative pole, as in the eggs of birds and reptiles. [G. telos, end, + G. lekithos, yolk] * * * telo·lec·i·thal .tel ō les ə thəl, .tēl adj of an egg having the … Medical dictionary
disk — 1. A round, flat plate; any approximately flat circular structure. 2. SYN: lamella (2). 3. In dentistry, a circular piece of thin paper or other material, coated with an abrasive substance, used for cutting and polishing tee … Medical dictionary
Micromere — Mi cro*mere, n. [Micro + mere.] (Biol.) One of the smaller cells, or blastomeres, resulting from the complete segmentation of a telolecithal ovum. [1913 Webster] … The Collaborative International Dictionary of English
holoblastic — Denoting the involvement of the entire (isolecithal or moderately telolecithal) ovum in cleavage. [holo + G. blastos, germ] * * * ho·lo·blas·tic .hō lə blas tik, .häl ə adj characterized by cleavage planes that divide the whole egg into distinct… … Medical dictionary
pole — 1. One of the two points at the extremities of the axis of any organ or body. 2. Either of the two points on a sphere at the greatest distance from the equator. 3. One of the two points in a magnet or an electric battery or cell having extremes… … Medical dictionary
egg — The female sexual cell, or gamete; after fertilization and fusion of the pronuclei it is a zygote and no longer an e.. In reptiles and birds, the e. is provided with a protective shell, membranes, albumin, and yolk for the nourishment of the … Medical dictionary
Isolecithal — ( Greek iso = equal, lekithos = yolk) refers to the even distribution of yolk in the cytoplasm of ovums of mammals and other invertebrates notably Petromyzontidae , Acipenseridae , Amiidae , and Lepisosteidae . Isolecithal cells have two equal… … Wikipedia
cleavage — 1. Series of mitotic cell divisions occurring in the ovum immediately following its fertilization. SYN: segmentation (2). SEE ALSO: c. division. 2. Splitting of a complex molecule into two or more simpler molecules. SYN: scission (2). 3 … Medical dictionary
animal development — Introduction the processes that lead eventually to the formation of a new animal starting from cells derived from one or more parent individuals. Development thus occurs following the process by which a new generation of organisms is produced by … Universalium
