Immunolocalization of serotonin in Onychophora argues against segmental ganglia being an ancestral feature of arthropods-3

<p><b>Copyright information:</b></p><p>Taken from "Immunolocalization of serotonin in Onychophora argues against segmental ganglia being an ancestral feature of arthropods"</p><p>http://www.biomedcentral.com/1471-2148/7/118</p><p>BMC Evolutionary Biology 2007;7():118-118.</p><p>Published online 15 Jul 2007</p><p>PMCID:PMC1933538.</p><p></p>portions of leg nerves and peripheral nerves have been obliterated during preparation. The somata of 5-HT-lir neurons (arrowheads) do not form any clusters or an identifiable pattern but are instead irregularly scattered along the nerve cord. Scale bar: 200 μm. (B) Detail of a whole-mount preparation of a nerve cord in dorsal view. 5-HT-lir fibers leave the neuropil (np) a peripheral nerve (pn). Arrowhead indicates a unipolar 5-HT-lir neuron. Scale bar: 50 μm. (C) Detail of peripherally situated somata of unipolar 5-HT-lir neurons (ventral view). Like in , the neurites of 5-HT-lir neurons (arrows) do not fasciculate with other fibers in but run as single processes towards the neuropil. Scale bar: 20 μm. Abbreviations: co, commissures; le, leg nerves; np, neuropil; pe, perikaryal layer; pn, peripheral nerves