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The embryo map is a sequence of 3-D images, or slices of 3-D images, of the developing embryo which, if viewed rapidly in temporal order, forms a time-lapse view of the growing embryo. The embryogenic tree is a diagram which shows the temporal development of each of the cell lines in the embryo.
The nursing model is a consolidation of both concepts and the assumption that combine them into a meaningful arrangement. A model is a way of presenting a situation in such a way that it shows the logical terms in order to showcase the structure of the original idea. The term nursing model cannot be used interchangeably with nursing theory.
Behavioral system model, nursing theorist Dorothy E. Johnson (August 21, 1919 – February 4, 1999) [ 1 ] was an American nurse, researcher, author, and theorist. She is known for creating the behavioral system model and for being one of the founders of modern system-based nursing theory .
The embryo successively adds the organs that characterize the animal classes in the ascending scale. When the human embryo, for instance, is but a simple vesicle, it is an infusorian; when it has gained a liver, it is a mussel; with the appearance of the osseous system, it enters the class of fishes; and so forth, until it becomes a mammal and ...
The theory of recapitulation, also called the biogenetic law or embryological parallelism—often expressed using Ernst Haeckel's phrase "ontogeny recapitulates phylogeny"—is a historical hypothesis that the development of the embryo of an animal, from fertilization to gestation or hatching (), goes through stages resembling or representing successive adult stages in the evolution of the ...
The fetal origins hypothesis (differentiated from the Developmental Origins of Health and Disease hypothesis, which emphasizes environmental conditions both before and immediately after birth) proposes that the period of gestation has significant impacts on the developmental health and wellbeing outcomes for an individual ranging from infancy to adulthood.
The embryo will develop insulin resistance and enzyme levels will convert the food that is not being used into fat, which in later life can lead to obesity and diabetes. Overall the environmental mismatch hypothesis is an advantage for human development but not without some disadvantage in later life.
Nüsslein-Volhard and Wieschaus identified genes involved in embryonic development by a series of genetic screens, generating random mutations in fruit flies using ethyl methanesulfonate. Some of these mutations affected genes involved in the development of the embryo.