Morphology, ultrastructure and synapse distribution of putative serotonergic salivary neurons in the locust

Peters, Brian H.; Butler, Stella; Tyrer, N. M.

doi:10.1016/0306-4522(87)90088-1

Cited by 17 publications

(1 citation statement)

References 32 publications

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“…1). Nerve 7B contains the axons of the two large efferent neurones SN1 and SN2 (Altman and Kien 1979;Peters et al 1987;Gifford et al 1991;Ali et al 1993). Both duct and nerve run parallel through the entire cervical region and enter the gland which is located in the pterothoracic segments.…”

Section: Innervation Of Locust Salivary Glandmentioning

confidence: 99%

Activity pattern of suboesophageal ganglion cells innervating the salivary glands of the locust Locusta migratoria

Schachtner

Bräunig

1995

J Comp Physiol A

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The salivary gland of the locust, Locusta migratoria, is innervated from the suboesophageal ganglion by two neurones, SN1 and SN2 which innervate the gland via the salivary gland nerve (nerve 7B of the suboesophageal ganglion). In addition, like most other peripheral nerves of the head, this nerve carries on its outer surface axons and neurohaemal terminal ramifications of the so called satellite nervous system, established by a group of neurosecretory cells also located in the suboesophageal ganglion. These superficial collaterals ramify over the nerve from its origin in the head to its terminals within the gland in the thoracic segments.Nerve 7B was recorded chronically in freely moving locusts. Both salivary neurones are active during and shortly before feeding, as defined by continuous rhythmic activity of the mandibular closer muscle (M9). The activity of the salivary neurones, particularly that of SN2, thus resembles that of the satellite neurones as described recently. While SN2 ceases firing at the end of a feeding bout, SN1 continues firing for a short period. Also, SN1 fires short bursts of impulses for a few minutes following the end of a feeding bout. Similar bursts also occur at random intervals during the longlasting phases between feeding events.Key words Insect 9 Salivary glands -Serotonin -5-hydroxytryptamine 9 Dopamine -Feeding Abbreviations SN1 salivary neurone 1 9 SN2 salivary neurone 2-M9 mandibular closer muscle 9 DUM dorsal unpaired median -LMN labral median nerve J. Schachtner 9 P. Br/iunig (5:~)

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Section: Innervation Of Locust Salivary Glandmentioning

confidence: 99%

Activity pattern of suboesophageal ganglion cells innervating the salivary glands of the locust Locusta migratoria

Schachtner

Bräunig

1995

J Comp Physiol A

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Serotoninergic innervation of the locust mandiblar closer muscle modulates contractions through the elevation of cyclic adenosine monophosphate

Baines

Tyrer

Downer

1990

J of Comparative Neurology

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The mandibular closer muscles of the locust receive innervation that is immunoreactive for the putative transmitter 5-hydroxytryptamine (5-HT). Cobalt-labelling suggests that the origin of this innervation is a group of cells located anteriorly in the suboesophageal ganglion. Bath application of 5-HT while the muscles are active produces marked changes in the contractions, increasing their amplitude, rate of contraction, and rate of relaxation. Incubation of isolated muscles with 5-HT shows that this amine elevates the levels of the cyclic nucleotide cyclic adenosine monophosphate (cAMP). In addition compounds that artificially elevate the levels of cAMP in the muscle--3-isobutyl-1-methylxanthine (IBMX), forskolin, and the cAMP analogue 8-(4-chlorophenylthio) cAMP--mimic the actions of 5-HT, whereas a potent inhibitor of insect adenylate cyclase, adenosine, considerably delays the onset of the effects produced by 5-HT. The effects observed with 5-HT in the mandibular muscle are similar to those of octopamine in the locust extensor tibiae muscle, and it is possible that this is an analogous modulatory system.

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Ultrastructure of the synaptic terminals of the dorsal giant serotonin‐IR neuron and deutocerebral commissure interneurons in the accessory and olfactory lobes of the crayfish

Sandeman

Watson

Sandeman

1995

J of Comparative Neurology

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The olfactory and accessory lobes in the crayfish are large spherical neuropils found on each side of its brain. The olfactory lobes receive the afferent axons of chemoreceptors that are located along the outer branches of the biramous first antennae. The accessory lobes receive a large input from interneurons whose axons lie in the deutocerebral commissure. A pair of large serotonergic neurons (the dorsal giant neurons) branch unilaterally in the accessory and olfactory lobes of each side. From physiological recordings, it has been proposed that the deutocerebral commissure interneurons synapse with elements in the accessory lobes that in turn connect to the dorsal giant neuron. It has also been proposed that the dorsal giant neuron is activated by inputs in the accessory lobe and that its output is in the olfactory lobe. This ultrastructural study tests this hypotheses by examining the polarity of synaptic terminals on dorsal giant neurons and deutocerebral interneurons that have been filled with neurobiotin. In double-labelled preparations, we found the deutocerebral interneurons to be presynaptic to elements in the accessory lobes, but none of these postsynaptic elements was identifiable as the dorsal giant neuron. The dorsal giant neurons receive many more synaptic inputs in the accessory lobes than in the olfactory lobe. Very few giant serotonin neuron output synapses were found in either lobe.

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Morphology, ultrastructure and synapse distribution of putative serotonergic salivary neurons in the locust

Cited by 17 publications

References 32 publications

Activity pattern of suboesophageal ganglion cells innervating the salivary glands of the locust Locusta migratoria

Activity pattern of suboesophageal ganglion cells innervating the salivary glands of the locust Locusta migratoria

Serotoninergic innervation of the locust mandiblar closer muscle modulates contractions through the elevation of cyclic adenosine monophosphate

Ultrastructure of the synaptic terminals of the dorsal giant serotonin‐IR neuron and deutocerebral commissure interneurons in the accessory and olfactory lobes of the crayfish

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