Amphiblastula
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
The Amphiblastula is a developmental stage in eggs with complete unequal cleavage, characterized by a wall with smaller cells on the animal pole and larger, yolk-rich cells on the vegetative pole.
Encyclopedia entry (1928–1936)
AMPHIBLASTULA (from the Greek amphi- on both sides and blastula, see), a term introduced by Haeckel for designating the blastula stage in eggs with complete unequal cleavage (amphiblastic eggs). Such eggs, found in amphibians and some mammals, are distinguished by a large quantity of yolk accumulating at the lower vegetative pole. The resulting blastula is characterized by its upper, animal wall consisting of small blastomeres, while the lower, vegetative wall is formed by large cells rich in yolk. The blastocoel lies eccentrically, being located closer to the animal pole.
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“Amphiblastula.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/amphiblastula/