primordium


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primordium

 [pri-mor´de-um]
the first beginnings of an organ or part in the developing embryo.

pri·mor·di·um

(prī-mōr'dē-ŭm),
An aggregation of cells in the embryo indicating the first trace of an organ or structure.
Synonym(s): anlage (1)
[L. origin, fr. primus, first, + ordior, to begin]

primordium

(prī-môr′dē-əm)
n. pl. primor·dia (-dē-ə)
An organ or a part in its most rudimentary form or stage of development.

pri·mor·di·um

, pl. primordia (prī-mōr'dē-ŭm, -ă)
An aggregation of cells in the embryo indicating the first trace of an organ or structure.
Synonym(s): anlage (1) .
[L. origin, fr. primus, first, + ordior, to begin]

pri·mor·di·um

, pl. primordia (prī-mōr'dē-ŭm, -ă)
An aggregation of cells in the embryo indicating the first trace of an organ or structure.
Synonym(s): anlage.
[L. origin, fr. primus, first, + ordior, to begin]
References in periodicals archive ?
In other words, this type is characterised by a strong downward development of both the coleoptile and the plumule, next to a continuous downwards growth of the root primordium, resulting in a complete torsion (Shah 1965; Van der Veken 1965; Goetghebeur 1986).
These findings may be related to the longer period that the plants remain photosynthetically active during the seed filling, especially when the application of N occurred in the floral primordium, favoring the seeds formation.
The separate primordial group (type 2, accessory gallbladder) refers to when there is more than one cystic primordium which arises from the biliary tree, and each gallbladder has its own cystic duct.
In HHEX knock-outmouse embryos at E9, the thyroid primordium is present and this does not affect the expression of Ttf1, Pax8, and Ttf2.
Primordium formation in axenic cultures of Agaricus bisporus (Lange) Sing.
calomelanos, leaf primordium (0.5 cm) of in vitro-raised sporophyte was used as explants.
The end of 1DP then begins to grow backward, down the mesentery, thus forming the primordium of the intestine.
The primordium of sweat glands was observed at 139 days in buffalo foetus 31].
The origin of a lingual thyroid is the result of a failure of the thyroid primordium to descend into the neck.
Due to early development of placental circulation, cardiac primordium appears as a preliminary raw just in front of the head crinkle outside the embryo.
Vascular differentiation and continuity was established early and before emergence of the elongating root primordium. The tissue organization in the adventitious roots appear normal with a well-defined root cap and root apical meristem in each root.