A primitive cell that develops into sensory nerve endings or sensory receptors in living tissues.
From Greek 'aisthesis' (sensation) + 'blastos' (germ or bud). The term emerged in 19th-century embryology to describe the cellular precursor to sensory structures.
This word reveals how scientists named the microscopic building blocks of touch and sensation before they could even see them clearly under early microscopes—they were essentially naming things based on what they predicted should exist!
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