Definition of Segmentation cavity. Meaning of Segmentation cavity. Synonyms of Segmentation cavity

Here you will find one or more explanations in English for the word Segmentation cavity. Also in the bottom left of the page several parts of wikipedia pages related to the word Segmentation cavity and, of course, Segmentation cavity synonyms and on the right images related to the word Segmentation cavity.

Definition of Segmentation cavity

Segmentation cavity
Segmentation Seg`men*ta"tion, n. The act or process of dividing into segments; specifically (Biol.), a self-division into segments as a result of growth; cell cleavage; cell multiplication; endogenous cell formation. Segmentation cavity (Biol.), the cavity formed by the arrangement of the cells in segmentation or cleavage of the ovum; the cavity of the blastosphere. In the gastrula stage, the segmentation cavity in which the mesoblast is formed lies between the entoblast and ectoblast. See Illust. of Invagination. Segmentation nucleus (Biol.), the body formed by fusion of the male and female pronucleus in an impregnated ovum. See the Note under Pronucleus. Segmentation of the ovum, or Egg cleavage (Biol.), the process by which the embryos of all the higher plants and animals are derived from the germ cell. In the simplest case, that of small ova destitute of food yolk, the ovum or egg divides into two similar halves or segments (blastomeres), each of these again divides into two, and so on, thus giving rise to a mass of cells (mulberry mass, or morula), all equal and similar, from the growth and development of which the future animal is to be formed. This constitutes regular segmentation. Quite frequently, however, the equality and regularity of cleavage is interfered with by the presence of food yolk, from which results unequal segmentation. See Holoblastic, Meroblastic, Alecithal, Centrolecithal, Ectolecithal, and Ovum. Segmentation sphere (Biol.), the blastosphere, or morula. See Morula.

Meaning of Segmentation cavity from wikipedia

- and blastocele, and also called cleavage cavity, or segmentation cavity is a fluid-filled or yolk-filled cavity that forms in the blastula during very early...
- muscles and body cavity are generally segmented. However, this is not true for all of the traits all of the time: many lack segmentation in the body wall...
- The coelom (or celom) is the main body cavity in many animals and is positioned inside the body to surround and contain the digestive tract and other organs...
- Segmentation is the physical characteristic by which the human body is divided into repeating subunits called segments arranged along a longitudinal axis...
- absent in others, and Echiura and Sipuncula show no obvious signs of segmentation. In species with well-developed septa, the blood circulates entirely...
- described several frog species, and his work on the Archenteric and Segmentation Cavities of frogs are regarded as important contributions to our understanding...
- bodies divided into segments, but echiurans have secondarily lost their segmentation. The majority of echiurans live in burrows in soft sediment in shallow...
- oral cavity proper. The vestibule is the area between the teeth, lips and ch****s, and the rest is the oral cavity proper. Most of the oral cavity is lined...
- most arthropods. An arthropod has an open circulatory system, with a body cavity called a haemocoel through which haemolymph circulates to the interior organs...
- The dorsal portion of the vertebral column houses the spinal canal, a cavity formed by alignment of the neural arches that encloses and protects the...