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Figure 8 | Frontiers in Zoology

Figure 8

From: Comparative neuroanatomy suggests repeated reduction of neuroarchitectural complexity in Annelida

Figure 8

Neuroanatomy in four different polychaete species. (a) Horizontal section through the brain of the terebellid polychaete Pista cristata. Serotonin immunoreactivity and cell nuclei labelings reveal a close resemblance to the neuroanatomical conditions observed in the terebellid species E. nebulosa and T. cincinnatus. (b) Neuroanatomy of the brain in the sabellid polychaete Branchiomma bombyx as revealed by FMRF-like immunoreactivity. Similar to the condition in S. penicillus, the neuropil forms two fiber masses that are dorsally connected by a narrow neuropil band. Homogeneously distributed neuronal somata, some showing FMRF-like immunoreactivity, surround the brain. (c) FMRF-like immunoreactivity in horizontal brain sections of Sthenelais cf. limicola and (d) Aphrodita aculeata. Nuclear markers reveal numerous tightly packed cell bodies (gc) that surround the dorsal parts of mushroom body neuropils. Arrowheads: clusters of olfactory glomeruli. Scale bars: (a, c, d) 200 μm (b) 80 μm.

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