events: syncytial divisions 10-13, pole cell formation
Blastoderm nuclei are located peripherally, causing the egg surface to bulge out during divisions, causing the appearance of so-called "somatic buds". The duration of cleavage divisions 10-13 increases progressively, from approximately 8 min to 20 min.
The last four nuclear divisions of the preblastoderm Drosophila embryo are metasynchronous. Mitoses 10-13 progress in waves which usually originate at two different sites, one near the anterior and the other near the posterior egg and move centripetally.
Stage 4, in vivo (2.5 MB)
Stage 4, pole cell formation
Stage 4, basic fuchsin staining
Stage 4 (0.3 MB)