Parablast
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
This article defines the parablast as a secondary germ layer in early embryological theory. It explains the now-discarded theory proposed by Wilhelm His, which posited that the parablast was distinct from the archiblast and originated from maternal cells.
Encyclopedia entry (1928–1936)
PARABLAST (from Greek para-beside and blastos-germ), a secondary germ. According to the long-abandoned theory of the parablast, proposed by His (1868, 1876, 1878), two completely independent germs should be distinguished in a chicken egg: the main one or archiblast, from which the germ layers develop, and the parablast, which gives rise to blood and connective tissue (see Mesenchyme). According to His's initial views, which he himself soon abandoned, the parablast was supposed to represent cells of the maternal organism that had entered the white yolk of the egg and grown from there into the spaces between the germ layers.
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Cite this page
“Parablast.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.com/article/parablast/