The morphology of suboesophageal ganglion cells innervating the nervus corporis cardiaci III of the locust |
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Authors: | Peter Bräunig |
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Institution: | (1) Institut für Zoologie, Technische Universität München, Garching, Germany |
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Abstract: | Summary The nervus corporis cardiaci III (NCC III) of the locust Locust migratoria was investigated with intracellular and extracellular cobalt staining techniques in order to elucidate the morphology of neurons within the suboesophageal ganglion, which send axons into this nerve. Six neurons have many features in common with the dorsal, unpaired, median (DUM) neurons of thoracic and abdominal ganglia. Three other cells have cell bodies contralateral to their axons (contralateral neuron 1–3; CN 1–3). Two of these neurons (CN2 and CN3) appear to degenerate after imaginal ecdysis. CN3 innervates pharyngeal dilator muscles via its anterior axon in the NCC III, and a neck muscle via an additional posterior axon within the intersegmental nerve between the suboesophageal and prothoracic ganglia. A large cell with a ventral posterior cell body is located close to the sagittal plane of the ganglion (ventral, posterior, median neuron; VPMN). Staining of the NCC III towards the periphery reveals that the branching pattern of this nerve is extremely variable. It innervates the retrocerebral glandular complex, the antennal heart and pharyngeal dilator muscles, and has a connection to the frontal ganglion.Abbreviations
AH
antennal heart
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AN
antennal nerves
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AO
aorta
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AV
antennal vessel
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CA
corpus allatum
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CC
corpus cardiacum
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CN1, CN2, CN3
contralateral neuron 1–3
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DIT
dorsal intermediate tract
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DMT
dorsal median tract
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DUM
dorsal, unpaired, median
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FC
frontal connective
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FG
frontal ganglion
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HG
hypocerebral ganglion
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LDT
lateral dorsal tract
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LMN, LSN
labral motor and sensory nerves
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LN+FC
common root of labral nerves and frontal connective
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LO
lateral ocellus
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MDT
median dorsal tract
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MDVR
ventral root of mandibular nerve
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MVT
median ventral tract
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NCA I, II
nervus corporis allati I, II
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NCC I, II, III
nervus corporis cardiaci I, III
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NR
nervus recurrens
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NTD
nervus tegumentarius dorsalis
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N8
nerve 8 of SOG
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OE
oesophagus
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OEN
oesophageal nerve
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PH
pharynx
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SOG
suboesophageal ganglion
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T
tentorium
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TVN
tritocerebral ventral nerve
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VLT
ventral lateral tract
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VIT
ventral intermediate tract
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VMT
ventral median tract
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VPMN
ventral, posterior, median neuron
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1–7
peripheral nerves of the SOG
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36, 37, 40–45
pharyngeal dilator muscles |
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Keywords: | Retrocerebral complex Neurosecretion DUM neurons Moulting Locusta migratoria (Insecta) |
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