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Figure 9 | Frontiers in Zoology

Figure 9

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

Figure 9

Consecutive horizontal sections through the head of Hesione pantherina (proceeding ventrad from a-d). The overlay images show FMRFamide-like immunoreactivity (yellow, left half) and autofluorescence images (red, right half) together with DAPI-labeled cell nuclei (blue). Immunostainings reveal intricate patterns in the dorsal part of the fiber mass (a, b). Paired aggregations of small globuli cells (gc) are situated in front of the anterior eyes (ae) and give rise to stalk-like neuropils converging at the midline of the brain. While the central parts of these neuropils are nearly devoid of immunostaining, scattered FMRFamide-like immunoreactivity can be observed in the peripheral parts (b). Ventrally, the globuli cell mass extends posteriorly, surrounding the central fiber mass, which is now clearly separated into two hemispheres. Small spheroid subcompartments, reminiscent of olfactory glomeruli, can be discerned in the posterior region of each hemisphere (arrowheads). Autofluorescence also reveals a striation of the nervous tissue in the ventral part of the brain. ec circumesophageal connective, p palps, pa prostomial antennae, pe posterior eyes. Scale bar: 80 μm.

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