Sensory projections of identified coxal hair sensilla of the scorpionHeterometrus fulvipes (Scorpionidae) |
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Authors: | K Sasira Babu K Sreenivasulu V Sekhar |
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Institution: | (1) Department of Zoology, S V University P G Centre, 524 201 Kavali, India |
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Abstract: | The topography of long hair sensilla on the coxae of walking legs and pedipalps of the scorpionHeterometrus fulvipes is described. Identified long hair sensilla are cobalt filled, and central projections of sensory fibres are reported for
the first time in the suboesophageal ganglion of this scorpion. The afferent fibres arising from each long hair sensilla segregate
into ventral, dorsomedial and dorsal tracts upon their entry into the suboesophageal ganglion. These transverse tracts bifurcate
towards the middle of the leg neuromere and form three ipsilateral, plurisegrnental, longitudinal sensory pathways. Filling
a pair of bilaterally distributed long hair sensilla shows bilaterally arranged longitudinal afferent tracts interconnected
by distinct transverse commissures. Similar patterns of sensory projections are observed when filling homologous hairs on
other legs and pedipalps. Numerous fine collaterals arise from the longitudinal sensory trancts that subdivide and end in
small blebs presumed to be presynaptic endings. The dorsal and dorsomedial longitudinal tracts and their respective commissures
are in close association with the dendritic arborisations of pedipalpal and leg motor neurons, suggesting direct contact between
them. The probable functions of these multisegmental hair afferent pathways are discussed. |
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Keywords: | Long hair sensilla central projections cobalt staining scorpions |
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