Megaspheres
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
Megaspheres are large yolk globules found in the cavity beneath the germ layers in bird embryos. First described by Wilhelm His, these structures detach from the yolk surface to provide nutrition to the developing germ layers before disappearing.
Encyclopedia entry (1928–1936)
MEGASPHERES (from Greek megas—large and sphaira—sphere), an embryological term proposed by Wilhelm His to denote large yolk globules lying in the cavity beneath the germ layers in birds. They detach from the surface of the yolk, serve to nourish the germ layers, and soon disappear.
Related articles
Mentioned in
Cite this page
“Megaspheres.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/megaspheres/