Daytoplasma

Daytoplasma (from ancient Greek δεύτερος - second and plasma ) is the name proposed by Edward van Beneden for various kinds of inclusions (pigment grains, fatty drops, grain of starch, etc.) that are in the protoplasm of animal cells and are either spare (nutrient) substances, or metabolic products (excretory substances). The term “deuthoplasma,” as Oscar Hertvig has pointed out, is not entirely successful, since it is not a matter of plasma in the proper sense of the word; therefore, they were asked to say “cell inclusions” instead of “deuteroplasm”. The term “deutoplasma” is most often used in embryology , where they are designated nutrient inclusions of eggs , consisting mainly of the so-called yolk .