Central projections of antennal hair fields and descending interneurons in stick insect brain and suboesophageal ganglion

Goldammer J, Dürr V (2011)
In: Proc. Göttingen Neurobiol. Conf. T20-4A.

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The stick insect Carausius morosus continuously moves its antennae during locomotion to explore the environment for obstacles within the action range of the front legs. Each antenna is movable by means of two single-axis hinge joints ; the proximal head-scape- and distal scape-pedicel joint. Close to the distal margin of these joints ; seven hair fields (HF) are arranged with a variable number of sensilla. Ablation experiments of HFs revealed various changes in the antennal working range ; indicating their function as joint angle sensors. Furthermore ; descending brain interneurons (DINs) transmit short-latency information from antennal mechanoreceptors to motor centers of the thoracic ganglia.So far ; neuroanatomical studies on antennal HF projections within the brain and suboesophageal ganglion (SOG) are sparse (see Adv. Insect Physiol. 32:49-205). Here ; we examine the central projection pattern of all antennal HFs with respect to differences in arborisation pattern ; terminal neuropil region and vicinity to DINs. Through double-labeling experiments of HFs with ; e.g. antennal flagellar afferents ; other pedicellar mechanosensory sensilla or antennal motor nerves ; we obtained more insights into the organization of the antennal mechanosensory motor center (AMMC): for instance ; all afferents of the seven HFs have very similar and strongly overlapping terminal arborisations. Whole-mount preparations showed beyond extensive ramifications within the dorsal lobe (DL) of the deutocerebrum with collaterals descending to the SOG where they terminate in a postero-ventro-medial region. For stick insects it is largely unknown how many DINs are present within the brain and SOG and how many DINs project to the ventral nerve cord. To reveal the number and distribution of DINs we performed backfills of neck connectives and of connectives between pro- and mesothoracic ganglia. Stainings of neck connectives showed at least 190 pairs of brain DINs ; whereas backfills of connectives between pro- and mesothoracic ganglia displayed a reduced amount of at least 78 labeled pairs of cell bodies. Additionally ; double-labeling of DINs and HF afferents showed that DIN dendrites arborise in close vicinity of HF central projections and arborisation volumes of afferents and DINs strongly overlap. This supports the idea that short-latency information transfer from HFs to DINs involves only few synaptic relay connections within the deutocerebrum.
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Proc. Göttingen Neurobiol. Conf.
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Göttingen
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Goldammer J, Dürr V. Central projections of antennal hair fields and descending interneurons in stick insect brain and suboesophageal ganglion. In: Proc. Göttingen Neurobiol. Conf. 2011: T20-4A.
Goldammer, J., & Dürr, V. (2011). Central projections of antennal hair fields and descending interneurons in stick insect brain and suboesophageal ganglion. Proc. Göttingen Neurobiol. Conf., T20-4A.
Goldammer, J., and Dürr, V. (2011). “Central projections of antennal hair fields and descending interneurons in stick insect brain and suboesophageal ganglion” in Proc. Göttingen Neurobiol. Conf. T20-4A.
Goldammer, J., & Dürr, V., 2011. Central projections of antennal hair fields and descending interneurons in stick insect brain and suboesophageal ganglion. In Proc. Göttingen Neurobiol. Conf. pp. T20-4A.
J. Goldammer and V. Dürr, “Central projections of antennal hair fields and descending interneurons in stick insect brain and suboesophageal ganglion”, Proc. Göttingen Neurobiol. Conf., 2011, pp.T20-4A.
Goldammer, J., Dürr, V.: Central projections of antennal hair fields and descending interneurons in stick insect brain and suboesophageal ganglion. Proc. Göttingen Neurobiol. Conf. p. T20-4A. (2011).
Goldammer, Jens, and Dürr, Volker. “Central projections of antennal hair fields and descending interneurons in stick insect brain and suboesophageal ganglion”. Proc. Göttingen Neurobiol. Conf. 2011. T20-4A.
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