micropyle

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mi·cro·pyle

(mī'krō-pīl),
1. Minute opening believed to exist in the investing membrane of certain oocytes as a point of entrance for the sperm.
2. Former name for micropore.
[micro- + G. pylē, gate]
Farlex Partner Medical Dictionary © Farlex 2012

micropyle

(mī′krə-pīl′)
n.
Zoology A pore in the membrane covering the ovum of some animals through which a spermatozoon can enter.

mi′cro·py′lar adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

micropyle

a small canal in the integument surrounding the ovule of a flowering plant, through which the POLLEN TUBE usually enters the ovule on the way to the EMBRYO SAC. Water enters the seed via the micropyle prior to GERMINATION.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Besides, a few mature oocytes were found in the G2 group, and in some of them, it was possible to observe in the animal pole the presence of a micropylar apparatus, as described by Drummond et al.
paulense; not inclined in other Paraphasma representatives), size and shape of micropylar plate (larger and much more elongate in P.
Extracellular environments for the initiation of external fertilization and micropylar plug formation in a cottid species, Hemitripterus villosus (Pallas) (Scorpaeniformes) with internal insemination.
Aged seeds which have just started to germinate can be identified by a characteristic hole on the micropylar end which remains identifiable when the seed has been processed using side-striking techniques.
114 M HYPOCHLORITE-INDUCED DEATH REVEALS THAT MICROPYLAR CELL DIVISION IS NOT NECESSARY FOR DEVELOPMENT OF SPATHOGLOTTIS PLICATA SEEDLINGS.
The egg chorion surface showed a chorionic pattern resulting in irregular hexagonal patterns There were 18-19 short pipe micropylar projections mounted at the anterior pole.
Whereas, in sexual embryo sacs, a cell wall only covered the micropylar end of the reduced egg cell and the plasma membrane of the cell was exposed on the chalazal end.
gnemon, the functional female gametophyte consists of an enlarged, vacuolate micropylar region and a constricted, densely cytoplasmic chalazal region [ILLUSTRATION FOR FIGURE 3H OMITTED].
In shape, seeds are oblong to ovoid and are narrower at the micropylar end where the funiculus was terminally attached.