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Figure 3 | Frontiers in Zoology

Figure 3

From: Myogenesis in the basal bilaterian Symsagittifera roscoffensis (Acoela)

Figure 3

Embryo on the third day (55 hours, 46% of development between egg deposition and hatching), anterior faces upwards. A. An orthogonal muscle grid with longitudinal (lm) and circular (cm) muscles is established and very few diagonal muscles (dm) are present. B. Muscles are continuously formed on the basal side of the epidermal cells (double arrowheads point to cell membranes). Inset shows boxed area under higher magnification. Scale bar: 10 μm. C. Muscles emerge by branching off from circular muscles (arrowheads). D. Between cell borders a concentration of actin is visible (arrows). Scale: 25 μm.

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