- embryonic axis
- an imaginary line from the head end to the tail end of an embryo or, before that, the line of elongation of the primitive streak and groove.
Medical dictionary. 2011.
embryonic axis
Look at other dictionaries:
embryonic axis — an elongate thickening of blastoderm tissue; the primitive differentiation of the embryo … Dictionary of ichthyology
embryonic anideus — a blastoderm in which no embryonic axis develops … Medical dictionary
Axis — The axis is the second cervical vertebra (symbol: C2). It is called the axis because the uppermost cervical vertebra (called the atlas) rotates about the odontoid process of C2. The joint between the axis and atlas is a pivot type of joint. It… … Medical dictionary
embryonic shield — a thickened arm of the germ ring representing the future longitudinal axis of the embryo … Dictionary of ichthyology
anterior-posterior axis — the principal axis of the embryo. Also called rostrocaudal axis and embryonic axis … Dictionary of ichthyology
egg axis — noun : an embryonic axis passing through the animal and vegetal poles of an egg … Useful english dictionary
reproductive system, plant — Introduction any of the systems, sexual or asexual, by which plants reproduce. In plants, as in animals, the end result of reproduction is the continuation of a given species, and the ability to reproduce is, therefore, rather conservative … Universalium
Gastrulation — of a diploblast: The formation of germ layers from a (1) blastula to a (2) gastrula. Some of the ectoderm cells (orange) move inward forming the endoderm (red). Gastrulation is a phase early in the embryonic development of most animals, during… … Wikipedia
angiosperm — /an jee euh sperrm /, n. Bot. a plant having its seeds enclosed in an ovary; a flowering plant. Cf. gymnosperm. [ANGIO + SPERM] * * * ▪ plant Introduction any member of the more than 300,000 species of flowering plants (division Anthophyta) … Universalium
primitive streak — n an elongated band of cells that forms along the axis of an embryo early in gastrulation by the movement of lateral cells toward the axis and that develops a groove along its midline through which cells move to the interior of the embryo to form … Medical dictionary
