The nucleus lateralis tuberis in the fresh water teleost,Clarias batrachus linn

Zusammenfassung Nachweis, dass die Aktivität der Zellen des Nucleus lateralis bei Fischen, während der Ruhe- und Laichzeit untersucht, eine zyklische ist. Starke Granulation im Nucleus lateralis und Nucleus praeopticus wurde bei einem 21 Tage alten, kastrierten Fisch beobachtet: Granulationsschwund nach Injektion von Testosteronpropionat und Östradiol-dipropionat (Gesamtdosis 5 mg).

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The investigation was supported by a grant from the Ford Foundation, New-Delhi.     

Control of corpus allatum activity inDiploptera punctata: roles of the pars intercerebralis and pars lateralis

Summary Control of the corpora allata (CA) ofDiploptera punctata is maintained by at least 2 factors. The glands are directly inhibited by an allatostatin arriving at the CA via the nervi corporis cardiaci I (NCC I). Destruction of the putative source (median neurosecretory cells, MNC) of the allatostatin by radio-frequency (RF) cautery relieved the inhibition imposed on the CA of virgin females, and the glands became active. Similarly, destruction of the lateral neurosecretory cells (LNC) also relieved the inhibition. We propose that the LNC stimulated the MNC to release allatostatin. RF-cautery did not result in the activation of CA of pregnant or ovariectomized females. Activation of the CA may therefore require not only absence of the inhibitory factor but also the presence of a stimulatory one (perhaps from the ovary).     

The effect of electrical stimulation of olfactory tract on the nucleus preopticus in the catfishHeteropneustes fossilis (Bloch)

Résumé Chez leHeteropneustes fossilis normal le périkaryon des neurons du noyau préoptique montrent une grande accumulation de substance neurosécrétaire AF-positive. Stimulation électrique du nerf olfacteur pendant une minute menait à une dégranulation incomplète, tandis qu'un traitement de dux minutes produisait un épuisement presque complet de la substance neurosécrétoire. Les neurons de la portion magnocellulaire du noyau préoptique paraissent répondre plus rapidement que ceux de la portion parvocellulaire.     

Immunocytological localization of peptide analogs of alpha-endorphin in several neurons of the lateral nucleus tuberis of Carassius auratus L. and Cyprinus carpio L.]

Neurons of the pars lateralis of the N.L.T. of Carassius auratus and Cyprinus carpio display a positive immunocytological reaction with an anti alpha-endorphin serum. It is assumed that the peptides produced by these neurons are similar, if not identical, with alpha-endorphin, but their morphinomimetic properties have still to be established. Peptides of this kind may participate in the regulation of pituitary functions.     

Location of allatostatic centers in the pars lateralis regions of the brain of the Colorado potato beetle

Summary Selective lesions in the pars intercerebralis and pars lateralis areas of the brain of the adult Colorado potato beetle were produced by radiofrequency cautery. The effect of these lesions on the corpus allatum activity, determined by the short-term in vitro radiochemical assay, revealed that gland inhibitory centers are located in the pars lateralis.     

Ultrastructure of the oocyte follicles in the crustacean amphipod Orchestia gammarellus (Pallas)]

The follicle cells of the Crustacean Amphipoda Orchestia gammarellus produce syntheses at the level of the ergastoplasm and the Golgi body. No secretary cycle is observed. A complex but permeable network of intercellular spaces provides a path for possible transfollicular penetration for the exogenous fraction of the vitellus.     

Electrophysiologic and anatomic demonstration of inhibitory commisural vestibular neurons in the tench (Tinca tinca)]

Horseradish peroxydase was injected intracellularly in some of the medullary neurons which, in Fish, exhibit a passive hyperpolarizing potential after spinal cord stimulation (this indicates that such neurons both electrical and chemical inhibitions of the Mauthner cells). With positive staining, commissural vestibular neurons were identified; their axons cross the midline and they establish connexions with the Mauthner cell and with vestibular neurons of both sides. Thus the existence of a crossed vestibular inhibitory pathway, previously suggested by electrophysiological studies in lower Vertebrates as well as in Mammals, is now correlated with histological evidence.     

Presence of neurons synthesizing LH-RH in the anterior hypothalamus of the duck (Anas platyrhynchos)]

Using histochemical techniques with LH-RH anti-serum, a large number of LH-RH producing neurons were identified in the Duck hypothalamus, under different physiological conditions. The LH-RH pericaryas were localized in a well delimited area of the anterior hypothalamus, including the dorsal part of the periventricular preoptic nucleus. The LH-RH containing axons were directed downwards towards the infundibulum, and terminated within the external layer of the rostral and caudal median eminence, in close vicinity to the capillaries of the pituitary portal system.     

Identification of GABA accumulating neurons in the dorsal raphe nucleus]

A possible GABAergic innervation of the nucleus raphe dorsalis (NRD) was investigated by measuring glutamate decarboxylase activity in the NRD after lesioning the afferents of this nucleus. The slight decrease found in the enzymatic activity suggests that these afferents have a minor participation in the GABA innervation of the NRD and implies the existence of an intrinsic GABAergic system in this nucleus. This local innervation was demonstrated by radio-autography and shows fibers, axonal varicosities and cell bodies which accumulate 3H GABA in the caudal part of this nucleus.     

Relationship between the pars intermedia and the pars nervosa in the hypophysis of an antarctic seal

Resumen La pars intermedia de la hipófisis de la foca de Weddell (Leptonychotes weddelli) presenta trabéculas que irrumpen en la Pars nervosa. En estas trabéculas epiteliales se encuentran grumos y fibras de materialGömöri positivo. Este material no fué hallado en ninguna otra región de la adenohipófisis.

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This work has been carried out at the Scientific Station Almirante Brown in Antarctica during the Antarctic year 1966. It was supported by the Instituto Antártico Argentino. Contribución del Instituto Antártico Argentino No. 120.     

Variation of nuclear size of neurons of the ventromedial nucleus in relation to spermatogenesis in the squirrel monkey (Saimiri sciureus)

Zusammenfassung Nachweis, dass bei ausgewachsenen Totenkopfaffen (Saimiri sciureus) die Zellkerndurchmesser im Nucleus ventromedialis hypothalami in der Periode der hochaktiven Spermiogenese kleiner sind als zu Beginn der Brunstperiode. Da das limbische System mit diesem Kern zusammenhängt, sind direkte Einflüsse nicht auszuschliessen.