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We propose a 2D mechanical model of the ventral furrow formation inDrosophila that is based on undifferentiated epithelial cells of identicalproperties whose energy resides in their membrane. Depending on the relativetensions of the apical, basal, and lateral sides, the minimal-energy states ofthe embryo cross-section includes circular, elliptical, biconcave, and buckledfurrow shapes. We discuss the possible shape transformation consistent withreported experimental observations, arguing that generic collective mechanicsmay play an important role in the embryonic development in Drosophila.

Collective mechanics of embryogenesis: Formation of ventral furrow in Drosophila