The hollow ball-shaped stage of an embryo consisting of a single layer of cells surrounding a central cavity; also called a blastula.
From Greek 'blastos' (bud, germ) + 'sphaira' (sphere). Coined in embryology to describe the spherical early embryonic form in most animals.
The blastosphere is one of nature's simplest forms—a tiny hollow ball of cells—yet from this basic shape comes every complicated animal on Earth. It's like the universe's blueprint starting with a sphere.
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