germ layer

any of the three layers of cells in an animal embryo at the gastrula stage, from which the various organs and tissues develop. The outermost layer is the ectoderm, the middle layer is the mesoderm, and the inner layer is the endoderm.

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Psychology term of the day

November 25th 2024

thrombotic stroke

the most common type of stroke, occurring when blood flow to the brain is blocked by a cerebral thrombosis. A thrombotic stroke typically results from the narrowing and eventual occlusion of a large blood vessel in the brain, especially the carotid or middle cerebral artery, by atherosclerosis.