Neurosecretory Control of Ovarian Development in Schistocerca Gregaria

1962 ◽  
Vol s3-103 (61) ◽  
pp. 57-72
Author(s):  
K. C. HIGHNAM
Keyword(s):  
Ovarian Development ◽  
Schistocerca Gregaria ◽  
Positive Control ◽  
Neurosecretory Cells ◽  
Oocyte Development ◽  
Neurosecretory System ◽  
Desert Locust ◽  
Pars Intercerebralis ◽  
Terminal Oocyte ◽  
Old Females

Cautery of the neurosecretory cells of the pars intercerebralis, or removal of the corpora cardiaca, will prevent the development of the terminal oocytes in the ovaries of the desert locust. Implantation of brains into females whose neurosecretory cells have been cauterized results in some development of the terminal oocytes. Ovariectomy of immature females causes a precocious accumulation of material in the neurosecretory system. Electrical stimulation, drastic wounding, or enforced activity of 14-day-old females reared without males brings about release of material from the neurosecretory system, and also accelerates development of the terminal oocytes. Copulation by these females also results in release of material from the neurosecretory system, and is followed by rapid terminal oocyte development. It is concluded that the neurosecretory system in Schistocerca gregaria exerts a positive control over oocyte development, and that copulation may stimulate release of material from the neurosecretory system.

scholarly journals The Influence of Mature Males on the Neurosecretory Control of Ovarian Development in the Desert Locust

1962 ◽  
Vol s3-103 (61) ◽  
pp. 73-83
Author(s):  
K. C. HIGHNAM ◽  
O. LUSIS
Keyword(s):  
Ovarian Development ◽  
Rapid Development ◽  
Neurosecretory System ◽  
Desert Locust

The ovaries of the desert locust are made up of about 100 ovarioles. When females are reared with mature males, the terminal oocytes in the ovarioles develop very much more rapidly than the terminal oocytes of females reared without males. In addition, the percentage of terminal oocytes which are resorbed during development increases more rapidly in females reared without males than in females reared with mature males. This results in a significantly larger percentage of mature eggs being produced by females reared with mature males. The neurosecretory system contains little stainable material in females whose terminal oocytes are developing rapidly in the presence of mature males, but contains a large amount when the terminal oocytes are mature. In females reared without males, whose terminal oocytes either develop slowly or remain undeveloped, the neurosecretory system shows a precocious accumulation of stainable material. It is concluded that the neurosecretory system is actively extruding secretion when the amount of contained material is small, and that material is accumulating and not being released when it is present in large amount. The presence of mature males somehow brings about the release of material from the female neurosecretory system, with consequent rapid development of terminal oocytes and the production of a larger number of eggs.

The effect of feeding on the cerebral neurosecretory system of the adult male tsetse, Glossina austeni Newst

1978 ◽  
Vol 56 (9) ◽  
pp. 1988-1992 ◽  
Author(s):  
M. Grossman ◽  
K. G. Davey
Keyword(s):  
Adult Male ◽  
Neurosecretory Cells ◽  
Neurosecretory System ◽  
Neurosecretory Material ◽  
Corpus Cardiacum ◽  
Pars Intercerebralis ◽  
Corpora Cardiaca ◽  
Glossina Austeni ◽  
Effect Of Feeding

An analysis of the intensity of staining of the corpus cardiacum and of the neurosecretorty cells of the pars intercerebralis in 3-day-old fed or fasting adult male tsetse has revealed two periods of apparent release of neurosecretion. In fed males, stainable neurosecretion disappears from 14 of the 20 recognizable neurosecretory cells within 10 min of the termination of feeding. There is always less neurosecretory material in the corpora cardiaca of fed males. Secondly, there is an indication of a depletion of material from the cardiaca of both fed and fasted males at about 1700 hours EST.

The Histology of the Neurosecretory System of the Adult Female Desert Locust, Schistocerca gregaria

1961 ◽  
Vol s3-102 (57) ◽  
pp. 27-38
Author(s):  
K. C. HIGHNAM
Keyword(s):  
B Cells ◽  
Cell Activity ◽  
Neurosecretory System ◽  
Neurosecretory Material ◽  
Desert Locust ◽  
Pars Intercerebralis ◽  
Secretory Cycle ◽  
Corpora Cardiaca ◽  
D Cells ◽  
A And B Cells

The pars intercerebralis of the brain of the desert locust contains about 2,400 cells in two groups, which stain with chrome-haematoxylin-phloxin and with paraldehydefuchsin. On the basis of differences in size and staining reactions, four types of cell, called A-, B-, C-, and D-cells may be differentiated. The A- and B-cells produce different kinds of material; they are not thought to be stages in a secretory cycle. The C- and D-cells are probably not neurosecretory. The corpora cardiaca are divided into two regions. One part stores neurosecretory material from the pars intercerebralis and the other is glandular in appearance. Material discharged from the A- and B-cells in the immature female passes along the nervi corporis cardiaci I to the anterior parts of the corpora cardiaca. The mature female is characterized by the presence of very much larger amounts of material in the corpora cardiaca, in the nervi corporis cardiaci I, and in the A-cells of the pars intercerebralis. The significance of this larger amount of material with respect to neurosecretory cell activity is discussed.

Activation of the peptidergic neurosecretory system in Diphyllobothrium dendriticum (Cestoda: Pseudophyllidea)

Parasitology ◽  
1981 ◽  
Vol 83 (2) ◽  
pp. 243-247 ◽  
Author(s):  
Margaretha K. S. Gustafsson ◽  
Marianne C. Wikgren
Keyword(s):  
Neurosecretory Cells ◽  
Final Host ◽  
Fish Host ◽  
Neurosecretory System ◽  
Weak Reaction ◽  
Diphyllobothrium Dendriticum ◽  
Large Numbers ◽  
Short Times

SUMMARYThe activation of the peptidergic neurosecretory system in Diphyllobothrium dendriticum was studied following cultivation of plerocercoids for short times in vitro and in vivo. In the plerocercoid the neurosecretory cells gave a very weak reaction with paraldehyde fuchsin (PAF). After cultivation for 1 h large numbers of neurosecretory cells filled with PAF-positive granules were evident. The significance of the activation of the neurosecretory system during the transfer of the worm from the cold-blooded fish host to the warm-blooded final host is discussed.

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