Gastrulation in Amphibians:

Bottle Cell Function

Bottle cells appear to function by creating a local invagination. At the same time, their cell bodies push inward, forcing deep material upward. The combined effect appears to be to roll the material of the marginal zone to create an incipient blastopore lip. The result is that the leading edge mesoderm This summary diagram is adpated from Hardin and Keller (1988).