How does the heart form? The heart is derived from the splanchnic lateral mesoderm and initially forms as two crescent-shaped endocardial plates inside the evolving pericardial cavity. As the embryo undergoes lateral and cranial folding, the two plates come closer to each other and [...]

Development Development in higher order organisms commences at conception and continues into old age. With every stage of development, changes in the physical properties of cells and tissues takes place. In some cases these changes result from fluctuations in the biochemical or metabolic activity [...]

What is cell migration? Cell migration is the directed movement of a single cell or a group of cells in response to chemical and/or mechanical signals. It is a fundamental cellular process that occurs throughout life, starting during embryonic development and continuing until death, [...]

What is cell polarity? Cell polarity refers to the intrinsic asymmetry observed in cells, either in their shape, structure, or organization of cellular components. Most epithelial cells, migrating cells and developing cells require some form of cell polarity for their function. These cells receive [...]

How is tubulogenesis regulated by mechanics? The basic steps during tube formation, including cell polarization, the formation of small multiple lumens and the coalescence of multiple lumens into a single lumen, and subsequent tube elongation, are directly regulated by mechanical signals arising from neighbouring [...]

What are epithelial tubes? Tubulogenesis, or the formation of tubes, is one of the fundamental morphogenetic events taking place during development. Several major organs, such as the respiratory, circulatory, and secretory systems, are constituted by an interconnected network of tubes. Within the body, tubes [...]

How is dorsal closure controlled by mechanics? A number of studies, which describe the cellular mechanisms and signaling pathways underlying dorsal closure, have pointed towards a mechanical basis for the morphogenetic changes associated with this process. It is now evident that a coordinated interplay [...]

What is dorsal closure? The shaping of the embryo during development is driven by large-scale movements of epithelial cell sheets as they bend, spread, and fuse with each other. One such major, well-defined morphogenetic event is dorsal closure, which occurs during the early stages [...]

How does the vascular system form? What is vasculogenesis? Vasculogenesis refers to the morphogenetic process occurring during the earliest stages of embryonic development by which a de novo vascular system, consisting of the heart and the blood vessels, is formed from mesodermal precursor cells. [...]

How do cardiomyocytes differentiate? Cardiomyocytes are the chief cell type in the heart and their coordinated contraction as a mass is responsible for the pumping of blood around the developing embryo. Cardiac specification occurs very early on during embryonic development. For instance, in mouse [...]

What processes occur during cardiac development? The heart is the first functional organ to form during the development of an embryo, which, in humans, occurs during the third week post-fertilization. It primarily involves the following sequence of events: the specification of cardiac precursor cells [...]

How are lipids and protein complexes segregated during cell polarization? In polarized epithelial cells, the apical membrane is rich in PIP2 and houses the PAR and Crumbs polarity complexes while the basal membrane contains PIP3 and the Scribble polarity complex [1][2]. The phosphatase PTEN, [...]