<i>Iphita limbata</i>
            Stal.: Components of Neurosecretory Material

Seshan, K. R.; Ittycheriah, P.I.

doi:10.1126/science.153.3734.427

Cited by 10 publications

(4 citation statements)

References 6 publications

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“…Axons from the A-cells do not seem to terminate in the CC. This also is true for other heteropterans such as Iphita (Seshan and Ittycheriah 1966;Seshan 1968), Dysdercus, Ranatra and Belostoma (Dogra 1967(Dogra a, b, 1969, Halys (Srivastava 1969), and Scutellera (Srivastava and Dogra 1969). Thus, in all these species the aorta is the neurohemal organ for the A-cells.…”

Section: Discussionmentioning

confidence: 82%

“…In all other heteropterans where the aorta is suspected (Cazal 1948;Nayar 1956a;Junqua 1956;Ewen 1962) or proven (Seshan and Ittycheriah 1966;Seshan 1968;Dogra 1967aDogra , b, 1969Srivastava 1969;Srivastava and Dogra 1969) to be the neurohemal site, only A-cell material was presumed to be involved. Johansson (1958) observed only A-type material in the aortic wall in Oncopeltus.…”

Section: Discussionmentioning

confidence: 99%

“…Among these, the aorta in heteropteran insects is especially significant, serving as a storage-release organ for neurosecretory material of protocerebral origin (Johansson 1957(Johansson , 1958Seshan and Ittycheriah 1966;Dogra 1967aDogra , b, 1969Seshan 1968;Srivastava 1969;Srivastava and Dogra 1969). Although light-microscope investigations of the neuroendocrine system have been carried out in a number of heteropteran insects (Cazal 1948;Nayar 1955aNayar , b, 1956aJunqua 1956;Johansson 1957Johansson , 1958Ewen 1962;Wigglesworth 1964;Prabhu 1966;Seshan and Ittycheriah 1966;Schreiner 1966;Dogra 1967aDogra , b, 1969Seshan 1968;Srivastava 1969;Srivastava and Dogra 1969), almost nothing is known about the ultrastructure of this system except in Rhodnius prolixus (Beaulaton 1967;Maddrell 1967;Busselet 1969) and in Eurygaster integriceps (Panov and Bassurmanova 1970). Johansson (1958) conducted a detailed histophysiological study of the neuroendocrine system in Oncopeltus fasciatus.…”

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confidence: 99%

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Ultrastructural Analysis of the Neuroendocrine Apparatus of Oncopeltus fasciatus (Heteroptera)

1971

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In Oncopeltus fasciatus, the A‐cells of the pars intercerebralis and their tracts are stainable in situ with the performic acid‐victoria blue (PAVB) method. The axons from these cells, after traversing the corpus cardiacum, terminate in the anterior part of the aorta which thus serves as the neurohemal organ. Ultrastructurally, four types of secretory neurons are distinguishable in the pars intercerebralis region: pic‐I with granules measuring 1000–3000 Å in diameter; pic‐II with granules of irregular size and shape, the elongate ones showing mean dimensions of 2400 × 1400 Å; pic‐III with less electron‐dense granules measuring 1000–2700 Å in diameter; pic‐IV, present not only in the pars intercerebralis but also in adjacent regions of the brain, with variable proportions of granules measuring 700–1800 A and dense‐cored vesicles measuring 1000–2400 Å. The nervi corporis cardiaci contain at least three types of neurosecretory axons, based on granule content, presumably representing pic‐I, pic‐II and pic‐III neurons. The wall of the aorta contains endings of at least three distinct types, again representing pic‐I, pic‐II and pic‐III neurons, and thus provides the neurohemal site for these three types of protocerebral neurosecretory cells. Axons of pic‐IV neurons appear to enter the cerebral neuropil. The corpus cardiacum is composed of two types of parenchymal secretory cells, with electron‐dense granules measuring 1300–3000 Å and 1000–2300 Å in diameter, respectively. The corpus cardiacum also contains interstitial cells and some axons of extrinsic origin, with and without granules. The corpus allatum may be paired or median, and receives a small number of at least two types of axons. The corpora allata of some reproducing females show a large number of PAVB‐stainable inclusions which appear to be modified cytoplasmic organelles, but are definitely not neurosecretory material. The hypocerebral ganglion is composed of two types of secretory‐appearing neurons and glial cells. The two neuronal types contain secretory granules, 1000–3000 Å and 900–2100 Å in diameter, respectively. Axons of the recurrent nerve also may contain occasional granules. In this heteropteran insect, the two principal functions of the corpus cardiacum appear to be spatially separated: the neurohemal function is subserved by the aortic wall, which permits release of material into both the aortic lumen and the hemocoel, and the intrinsic endocrine function is possessed by the parenchymal cells.

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Section: Discussionmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Ultrastructural Analysis of the Neuroendocrine Apparatus of Oncopeltus fasciatus (Heteroptera)

1971

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“…In the heteropteran bugs, the corpus cardiacum is no longer considered as the neurohaemal organ and this function has been, attributed to the aorta instead (JOHANSSON, 1958;SESHAN & ITTYCHERIAH, 1966;DOGRA, 1967a & b;SHRIVASTAVA, 1970. AWASTHI, 1972a, 1973.…”

Section: Introductionmentioning

confidence: 99%

Morphology and the Axonal Connections of the Corpus allatum of Dysdercus similis FREEMAN (Heteroptera, Pyrrhocoridae)

Pathak¹

1980

Mitt. Mus. Nat.kd. Berl., Dtsch entomol.

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The axonal connections of the corpus allatum of Di~dercus s i n i i h have been investigated in detail. Apart from the two already known nervi corpori cardiaci (NCC I & NCC 11) of each side, additional axonal connections between the Corpora Cardiaca (CC) and the aortal wall, between thecorpus allatum and the aortal wall and between the corpus allatum and the oesophagus have been noted for the first time. The importance of the corpus cardiacum as the main neurohaemal organ vis-a-vis the terminal axons of nervi allati aorti (NAA) and/or the aortal wall, has been discussed.

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Studies on the neurosecretory system and retrocerebral endocrine glands of Nezara viridula Linn. (Heteroptera: Pentatomidae)

Awasthi

1972

Journal of Morphology

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The neurosecretory system and retrocerebral endocrine glands of Nezara viridula Linn. have been described on the basis of in situ preparations and histological sections employing the paraldehyde fuchsin (PF) and performic acid-victoria blue (PAVB) techniques.In the brain of N. viridula, there are two medial groups -each consisting of five neurosecretory cells which belong to A-type. The lateral neurosecretory cells are absent. The axons of the two groups of medial neurosecretory cells (MNC) compose the two bundles of neurosecretory pathways (NSP) that decussate in the anterodorsal part of the protocerebrum. The two pathways, after the cross-over, run deep into the protocerebrum and deutocerebrum and emerge as NCC-I from the tritocerebrum. The nervi corporis cardiaci-I (NCC

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Iphita limbata Stal.: Components of Neurosecretory Material

Abstract: The median neurosecretory cells of the pars intercerebralis of Iphita limbata seem to release two demonstrable components, probably representing allatotropin to the corpus allatum and myotropin to the aortic neurohemal site.

Cited by 10 publications

References 6 publications

Ultrastructural Analysis of the Neuroendocrine Apparatus of Oncopeltus fasciatus (Heteroptera)

Ultrastructural Analysis of the Neuroendocrine Apparatus of Oncopeltus fasciatus (Heteroptera)

Morphology and the Axonal Connections of the Corpus allatum of Dysdercus similis FREEMAN (Heteroptera, Pyrrhocoridae)

Studies on the neurosecretory system and retrocerebral endocrine glands of Nezara viridula Linn. (Heteroptera: Pentatomidae)

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