Studies on the neuronal organization of cockroach corpora pedunculata

Frontali, N.; Mancini, G

doi:10.1016/0022-1910(70)90152-6

Cited by 29 publications

(14 citation statements)

References 7 publications

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“…Our experiments indicate that uPNs in M. sexta form primarily, if not exclusively, output synapses in the protocerebum, consistent with findings in other species of insects (Trujillo-Cenóz and Melamed, 1962;Frontali and Mancini, 1970;Schü rmann, 1974). Interestingly, similar findings also have been obtained for a functionally related type of neuron, the deutocerebral projection neuron, in crayfish (Sandeman and Luff, 1973;Mellon et al, 1992).…”

Section: Synapses Of Upns In the Protocerebrumsupporting

confidence: 88%

“…Mellon et al (1992) have suggested that the rosette-like structures in crayfish are specialized synaptic structures that allow the projection neurons to control the synchronized activity of their target neurons in the hemi-ellipsoid body, which display periodic oscillations in membrane potential. In insects, the likely targets of axons in the calyces are Kenyon cells (Trujillo-Cenóz, and Melamed, 1962;Frontali and Mancini, 1970;Schü rmann, 1974), which also, in locusts, display synchronized oscillatory responses to odorant stimuli (Laurent and Naraghi, 1994). Thus, although Laurent and Naraghi (1994) think it unlikely that the oscillatory response of Kenyon cells is due to direct AL input, it is possible that the uPNs produce or assist synchronous activation by recruiting a large number of Kenyon cells simultaneously.…”

Section: Synapses Of Upns In the Protocerebrummentioning

confidence: 95%

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Synaptic organization of the uniglomerular projection neurons of the antennal lobe of the mothManduca sexta: A laser scanning confocal and electron microscopic study

1997

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The detailed branching pattern and synaptic organization of the uniglomerular projection neurons of the antennal lobe, the first processing center of the olfactory pathway, of the moth Manduca sexta were studied with laser scanning confocal microscopy and a technique combining laser scanning confocal microscopy and electron microscopy. Uniglomerular projection neurons, identified electrophysiologically or morphologically, were stained intracellularly with neurobiotin or biocytin. Brains containing the injected neurons were treated with streptavidin-immunogold to label the injected material for electron microscopy and with Cy3-streptavidin to label the neurons with fluorescence for laser scanning confocal microscopy, and then embedded in Epon. Labeled neurons were imaged and reconstructed with laser scanning confocal microscopy (based on the retained fluorescence of the labeled neuron in the Epon block), and thin sections were cut at selected optical levels for correlation of light microscopic data and electron microscopic detail. Each neuron had a cell body in one of the three cell-body clusters of the antennal lobe, a primary neurite that extended across the coarse neuropil at the center of the antennal lobe and then formed a dense tuft of processes within a single glomerulus, and an axon that emanated from the primary neurite and projected from the antennal lobe via the antenno-cerebral tract to the lateral horn of the ipsilateral protocerebrum and, collaterally, to the calyces of the mushroom body. In the electron microscope, the fine dendritic branches in the apical zones of the glomeruli, where sensory axons terminate, were found to receive many input synapses. In deeper layers across the glomeruli, the processes participated in both input and output synapses, and the bases of the glomeruli, the most proximal, thickest branches formed output synapses. In both of the protocerebral areas in which axonal branches terminated, those branches formed exclusively output synapses. Our findings indicate that, in addition to conveying olfactory information to the protocerebrum, uniglomerular projection neurons in the antennal lobes of M. sexta participate in local intraglomerular synaptic circuitry.

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Section: Synapses Of Upns In the Protocerebrumsupporting

confidence: 88%

Section: Synapses Of Upns In the Protocerebrummentioning

confidence: 95%

Synaptic organization of the uniglomerular projection neurons of the antennal lobe of the mothManduca sexta: A laser scanning confocal and electron microscopic study

1997

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“…In line with these findings, it has been reported that the number of mushroom body neuroblasts in the CNS ranges from one in the moth, to as many as 500 in the bee (Farris & Sinakevitch 2003). Although they are known to have an inhibitory effect on locomotor, respiratory, and reflex activities in insects (Frontali & Mancini 1970;Weiss 1972) including complex social behavior of bees and termites (Howse 1975), it is still not clear in spiders whether these structures are essential for web-building behavior. Therefore, additional morphological and molecular data from representatives of all four arthropod groups will be required to resolve this question.…”

Section: Discussionmentioning

confidence: 95%

“…We have shown here that the globuli and associated mushroom bodies (corpora pedunculata) are not observed in the protocerebrum. Although they are known to have an inhibitory effect on locomotor, respiratory, and reflex activities in insects (Frontali & Mancini 1970;Weiss 1972) including complex social behavior of bees and termites (Howse 1975), it is still not clear in spiders whether these structures are essential for web-building behavior. Although the mushroom body-like neuropiles have been detected in annelids, chelicerates, and myriapods except in crustaceans , the mushroom bodies differ considerably in structure and function against homology.…”

Section: Discussionmentioning

confidence: 99%

Fine structure of the CNS ganglia in the geometric spider Nephila clavata (Araneae: Nephilidae)

Park

Kim

et al. 2013

Entomological Research

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As web spiders usually hang with their head downward, geometrical differences in body position could affect the organization of their central nervous system (CNS). Nevertheless, most of our knowledge of spider's CNS is dependent on what has been revealed from wandering spiders. To fill the gap, we describe here the fine structural organization of the ganglionic neurons and nerves in the geometric orb web spider Nephila clavata. Nerve cells in the supraesophageal ganglion in N. clavata are packed in the frontal, dorsal and lateral regions, but the nerve cells of the subesophageal mass are only restricted to the ventral and ventrolateral regions. High resolution transmission electron microscopy (TEM) reveals the fine structural details of the neuroglial cells and the neuronal cells which have a conspicuous Golgi apparatus, rough ER, free ribosomes and well‐developed mitochondria. Comparing fine structural characteristics of the CNS ganglia with those of wandering spiders in most respects, it has been revealed that the geometrical difference may affects to the arrangement of receptors in the central body known as an important association center for web building behavior. In particular, remarkable differences can be detected in the protocerebral area by the extraordinary development of the central body including absence of the globuli and associated mushroom bodies.

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“…1A). At the pedunculus and lobes, Kenyon cells make synapses onto dendrites of extrinsic (output) neurons (Schü rmann, 1970;Frontali and Mancini, 1970). Axons of extrinsic neurons project into different areas of the brain (Mobbs, 1984;Rybak and Menzel, 1993), including lateral Grant sponsor: Naitoh Foundation; Grant sponsor: Narishige Zoological Science Award; Grant sponsor: Ministry of Education, Science, Culture and Sports of Japan.…”

mentioning

confidence: 99%

Topography of modular subunits in the mushroom bodies of the cockroach

et al. 1998

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The mushroom body (MB), a conspicuous neuropil structure in the insect brain, is implicated in associative memory and in some aspects of motor control. Intrinsic neurons of the MB (Kenyon cells) extend dendrites into the calyx, and their axons run through the pedunculus and then bifurcate to form the alpha and the beta lobes. At the pedunculus and the lobes, Kenyon cells make synaptic connections with dendrites of extrinsic (output) neurons. Previously, we reported that the alpha lobe of the cockroach MB consists of repetitive modular subunits (Mizunami et al. [1997] Neurosci. Lett. 229:153-156). Each subunit is composed of a dark layer and a light layer, and the layers are refereed to as slabs. Each slab is composed of axons of a specific subset of Kenyon cells. In the present study, we examined serial sections of reduced silver preparations and found that each dark and light slab continues throughout the length of the pedunculus and the alpha and beta lobes. We also found that Golgi-impregnated Kenyon cells often exhibit a characteristic grouping, forming a thin sheet interlaced by dozens or hundreds of axons. The sheet is much thinner than the slab, and each sheet remains within a particular slab throughout the length of the pedunculus and the lobes. Thus, the sheet is a component forming the slab. In the pedunculus and the beta lobe, a class of Golgi-impregnated extrinsic neurons exhibit segmented dendritelike arbors that interact with every other slab, i.e., either with only dark or light slabs. Because each neuron of this class interacts with each particular set of dark or light slabs, we conclude that the slabs are units for transmitting output signals from the MB.

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Studies on the neuronal organization of cockroach corpora pedunculata

Cited by 29 publications

References 7 publications

Synaptic organization of the uniglomerular projection neurons of the antennal lobe of the mothManduca sexta: A laser scanning confocal and electron microscopic study

Synaptic organization of the uniglomerular projection neurons of the antennal lobe of the mothManduca sexta: A laser scanning confocal and electron microscopic study

Fine structure of the CNS ganglia in the geometric spider Nephila clavata (Araneae: Nephilidae)

Topography of modular subunits in the mushroom bodies of the cockroach

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