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Who proposed cell theory in 1838 and 1839?
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cell
Artist's conception of a human neuron.
The cell theory was proposed by the German botanist Matthias Jakob Schleiden and the German physiologist Theodor Schwann.123
In 1838, Schleiden stated that all plant parts are composed of cells or their derivatives. The following year, in 1839, Schwann extended this concept to include animals, establishing that cells are the fundamental units of structure and function in all living organisms. Their collaborative findings were formally presented in Schwann’s 1839 work, Mikroskopische Untersuchungen über die Übereinstimmung in der Struktur und dem Wachstume der Tiere und Pflanzen (Microscopical Researches into the Accordance in the Structure and Growth of Animals and Plants).1234