Spiral Cleavage

Spiral Cleavage
Occurs such that the resulting daughter cells are not located exactly on top of one another but instead at a slight angle. It is a characteristic of protostomes and results in determinant cells which are cells that have a determined embryological fate early on during the development of the embryo. In other words, determinant cells are programmed to become a specific type of cell early on during the process of embryological development of the organism.

See also: Development & Tissues: Embryogenesis