Define gastrulation and morphogenesis.
Define gastrulation and morphogenesis.
The development of a baby from the zygote during pregnancy involves several stages. It starts with the zygote formed after gametes' fertilization and forms a fully developed human structure within nine months of gestation. Blastulation, implantation, gastrulation, and morphogenesis are the several stages of human embryonic development.
The stage of human embryonic development in which a multi-layered structure known as gastrula is formed from the reorganization of the single-layered hollow sphere of the cells (blastula) is known as gastrulation. In human embryonic development, the gastrula contains three layers known as the ectoderm (outer layer), mesoderm (middle layer), and the endoderm (inner layer), which give rise to different organs and structures of the human body. Cells exhibit five types of movements known as invagination (folding of cell sheet toward blastula's inner side), involution (causing epithelial regression), ingression (embryonal migration of cells), delamination (migration of one sheet into two), and epiboly (one cell sheet expansion over other) during gastrulation.
The process that causes a cell, tissue, or organ to develop its shape is known as morphogenesis. The spatial distribution of cells occurs during morphogenesis in embryo development. It is associated with developing organs (kidney, liver, lungs) and external structures (eyes, ears, limbs) of the developing embryo by many division and differentiation cycles.
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