In the six eggs thus examined, all rotated their yolk mass towards the same side of the egg (< 90°) as the maturation spot meridian.
If the cell division of the twins was late, just before conjoined twins would occur, a single yolk sac would be apparent on the sonogram.
In the oocyte cortex were observed coated pits, coated vesicles, dense tubules, multivesicular bodies and primordial yolk spheres.
Another relevant aspect to be considered in the study of vitellogenesis is the incorporation of lipids into yolk platelets.
Three oocyte membranes (cleaned of yolk without disturbing the cytoplasmic layer) were spread on a polystyrene plate and weighted down with metallic rings.
The transverse yolk ducts unite in front of the ovary.
No signs of resorption of yolk were detected in any test.
Fully grown yolk platelets are the destination of most of the proteinaceous nutritive material to be internalised.
