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Figure 24 | Frontiers in Zoology

Figure 24

From: The normal development of Platynereis dumerilii (Nereididae, Annelida)

Figure 24

Brain and muscle development of P. dumerilii , 72 hpf - 5 days post fertilization, apical view, dorsal side up. The age of the larvae in each row is given in the lower left corner of the first picture of each row. The displayed staining is indicated at the bottom of each column. A, E, F, J, K, O: The dorsal and ventral branches of the circumesophageal connectives (drcc and vrcc) continue to approach each other. Finally only a small gap remains between the dorsal and ventral branch of the circumesophageal connectives at 5 days post fertilization (L). The prototroch ring nerve (ptrn) and the dorsal unpaired axon (ua) cannot be distinguished anymore from 5 days post fertilization onwards with the methods used in this study (L). B, G, L: New serotonergic cells become visible in the dorsal part of the brain at 4 and 5 days post fertilization (white arrow heads), additionally to those serotonergic cells that were present during previous stages (the central one marked with a white star, the more dorsal ones marked with white arrows). C, D, I, M, N: A complex pattern of muscles develops inside the head. CLSM microscopy, maximum projection, Imaris surpass mode. Scale bar in all images 20 μm. Further abbreviations see abbreviations list.

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