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An Outline of Developmental Physiology, Edition: 2Rev Ed by Chr. P. Raven and G. Kerkut (Auth.)

By Chr. P. Raven and G. Kerkut (Auth.)

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Presumably this is the more solid outer layer of the egg, the cortex. Polarity, then, depends on factors localised in the egg cortex; the axial gradients arise only as a result of these factors. There may be some exceptions to this rule. In amphibians, for example, the yolk gradient seems to be of decisive importance for the direction in which the embryo will later develop. If the eggs 52 POLARITY AND SYMMETRY; of an amphibian are turned upside down, and fixed in this position, the heavy yolk material will sink through the cyto­ plasm from the vegetative side toward the originally animal side of the egg.

22 THE INITIATION OF DEVELOPMENT: ending with the death of the egg. For normal development to occur, other factors must bring the egg cytoplasm into such a condition that, instead of the monastral radiation, a dicentric radiation, or amphiaster, can be formed. The latter leads to normal division, and thereby to cleavage of the egg. Bataillon has named this process ''regulation'*. In Loeb's method, the treatment with hypertonic sea water is the regulating factor; in Bataillon's method the inoculation of cell material acts as such.

In the eggs of many amphibians, a zone of lighter pigmentation, the socalled grey crescent, develops on one side of the egg along the boundary of the dark animal half in the first few hours after fertilisation. This marks the dorsal side of the egg, and later of the embryo. The opposite side becomes the ventral side (Fig, 14). Once the grey crescent has been formed, we can divide the egg into symmetrical halves in only one way, viz. through the meridional plane which bisects the grey crescent. In normal development this plane, the median plane, will be- T H E CORTICAL F I E L D 45 come the plane of symmetry of the embryo.

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