embryological development

embryological development

[-loj′ik]
the various intrauterine stages and processes involved in the growth and differentiation of the conceptus from the time of fertilization of the ovum until the eighth week of gestation. The stages are related to the biological status of the unborn child and involve the differentiation of the various cells, tissues, and organ systems and the development of the main external features of the embryo. It occurs from approximately the end of the second week to the eighth week of intrauterine life. The fetal stage follows these stages, beginning at about the ninth week of gestation. The entire process of growth and development of the embryo and fetus is loosely called prenatal development. See also prenatal development.
References in periodicals archive ?
The embryological development of thyroid gives us an anatomical roadmap to predict the locations of an ectopic thyroid tissue.
Illustration showing embryological development of the celiac artery and superior mesenteric artery during weeks 4 to 9 of intrauterine life.
Since phenytoin can disturb the endogenous metabolic processes, it can also have an adverse effect on the embryological development of the apical ectodermal ridge which may be its primary site of teratogenic action.
During the fourth week of embryological development these Schwann cells are derived from a specialized population of ectomesenchymal cells of the neural crest.
One suggests that the cysts arise from ectopic urethral mucosa sequestered during embryological development.
In the concluding section of the book, "Knowing and Being," Polanyi uses his knowledge of the embryological development in animal consciousness and intelligence to argue that neither consciousness nor intelligence can be explained by chemistry and physics alone.
Goode J and Russell J (1968) Incubation of eggs of three species of chelid tortoises and notes on their embryological development.
There was an urgent need to follow and adopt the latest research in the field of chromosomal analysis and embryological development, he observed.
Orbital dermoid cysts are believed to be embryologically derived heterotopic neoplasms resulting from entrapped aberrant primordial tissues during early embryological development.
In summary, the mouse prostate has a distinct anatomy and histology, in spite of similar embryological development, cellular composition, and molecular characteristics to human prostate.
Muscles in the upper limb originate from somites, and every muscle is identifiable by week 7 of the embryological development.