embryonic axis

em·bry·on·ic ax·is

the cephalocaudal axis established in the embryo by the primitive streak.
References in periodicals archive ?
The first cleavage plane and the embryonic axis are determined by separate mechanisms in Xenopus laevis.
After image analysis, the achenes were classified into three categories, based on internal structures: Full achenes with all the internal cavity filled by the cotyledons and embryo axis without damage; Malformed achenes with some abnormality in the morphology of the cotyledons or embryonic axis; and Empty achenes with the internal cavity fully translucent or having less than 50% of the tissues essential for germination.
The embryo of species of the Arecaceae family is formed by a single cotyledon, generally little differentiated, and the embryonic axis is in its proximal region.
Enzymatic assays were performed in five replicates of 1.0g of cotyledons each for [alpha]- and [beta]-amylase, and 0.1g of cotyledons and embryonic axis for G6PdH.
The gastrulation stage ends when the blastoderm completely covers the yolk, characterizing the 100% epiboly stage, which is marked by the presence of primary germ layers (endoderm, mesoderm and ectoderm) and the embryonic axis, giving rise to the subsequent stage characterized by organogenesis (Wolpert et al., 2000).
The development of the embryonic axis is mediated by auxins and cytokinins, while the increment both in number and size of cells is due to the embryo protein synthesis.
Conjoined twinning arises when the twinning event occurs at about the primitive streak stage of development at about 13-14 days after fertilization (2,3), Conjoined twinning occurs by the incomplete splitting of the embryonic axis and, with the exception of parasitic conjoined twins, all are symmetrical and "the same parts are always united to the same parts".
With inhibitors that are found within the embryonic axis, it is temperature (and sometimes light) that generally controls this shift.
Neurological features depend on the severity of the malformation and on the segmental level along the longitudinal embryonic axis, the degree of resulting kyphosis and the presence of associated abnormalities.
In introductory biology courses, soaked corn "seeds" (yes, caryopses) are longitudinally bisected along the embryonic axis (the white "shield").
The longest of the 24 articles propose that mitochondrial decline and mtDNA damage are central to the etiology of age-related diseases, and review the genetic control of embryonic axis formation in zebrafish.
The seeds were cut into two portions with a razor blade, and the portion of the seed that lacked the embryonic axis was used for fatty ester analysis.