embryonic axis

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.

Игры ⚽ Поможем решить контрольную работу

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

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”