Subcortical Rotation:

3D Model

The animation sequence below schematically demonstrates what is thought to happen during subcortical rotation of the fertilized amphibian egg. The dense, yolky vegetal deep cytoplasm rotates with respect to the overlying cortex to produce a 30 degree relative rotation.

A 3-d model of the relative movement of subcortical, yolky material with respect to the overlying cortex.

Size of Movie: 132 K