The distribution of neurones immunoreactive for ?-tyrosine hydroxylase, dopamine and serotonin in the ventral nerve cord of the cricket, Gryllus bimaculatus

1995 ◽  
Vol 280 (3) ◽  
pp. 583-604 ◽  
Author(s):  
Michael H�rner ◽  
Ulrike Sp�rhase-Eichmann ◽  
Johannes Helle ◽  
Br�ne Venus ◽  
Friedrich-Wilhelm Sch�rmann
Keyword(s):  
Tyrosine Hydroxylase ◽  
Nerve Cord ◽  
Ventral Nerve Cord ◽  
Gryllus Bimaculatus

The distribution of neurones immunoreactive for ?-tyrosine hydroxylase, dopamine and serotonin in the ventral nerve cord of the cricket, Gryllus bimaculatus

1995 ◽  
Vol 280 (3) ◽  
pp. 583-604 ◽  
Author(s):  
Michael H�rner ◽  
Ulrike Sp�rhase-Eichmann ◽  
Johannes Helle ◽  
Br�ne Venus ◽  
Friedrich-Wilhelm Sch�rmann
Keyword(s):  
Tyrosine Hydroxylase ◽  
Nerve Cord ◽  
Ventral Nerve Cord ◽  
Gryllus Bimaculatus

scholarly journals Physiological characterisation of antennal mechanosensory descending interneurons in an insect (Gryllus bimaculatus, Gryllus campestris) brain

2001 ◽  
Vol 204 (13) ◽  
pp. 2265-2275 ◽  
Author(s):  
Michael Gebhardt ◽  
Hans-Willi Honegger
Keyword(s):  
Electrical Stimulation ◽  
Experimental Evidence ◽  
Nerve Cord ◽  
Ventral Nerve Cord ◽  
Sensory Nerves ◽  
Gryllus Bimaculatus ◽  
Central Origin ◽  
Gryllus Campestris ◽  
Descending Interneurons ◽  
Stimulation Of

SUMMARY We investigated five different descending brain interneurons with dendritic arborizations in the deutocerebrum in the crickets Gryllus bimaculatus and G. campestris. These interneurones convey specific antennal mechanosensory information to the ventral nerve cord and all responded to forced antennal movements. These interneurones coded for velocity and showed preferences for distinct sectors of the total range of antennal movements. Their axons descended into the posterior connective either ipsilateral or contalateral to the cell body. Electrical stimulation of sensory nerves indicated that the interneurons received input from different afferents of the two antennal base segments. One interneuron had a particularly large axon with a conduction velocity of 4.4ms−1. This was the only one of the five interneurons that also received visual input. Its activity was reduced during voluntary antennal movements. The reduction in activity occurred even after de-efferentation of the antenna, indicating that it had a central origin. Although we do not have experimental evidence for behavioural roles for the descending antennal mechanosensory interneurons, the properties described here suggest an involvement in the perception of objects in the path of the cricket.

The distribution of histamine-immunoreactive neurons in the ventral nerve cord of the cricket, Gryllus bimaculatus

1996 ◽  
Vol 286 (3) ◽  
pp. 393-405 ◽  
Author(s):  
Michael Hörner ◽  
Johannes Helle ◽  
Friedrich-Wilhelm Schürmann
Keyword(s):  
Nerve Cord ◽  
Ventral Nerve Cord ◽  
Gryllus Bimaculatus

Extracellular filaments in the perineurium of the florida lobster, Panulirus argus

1987 ◽  
Vol 45 ◽  
pp. 784-785
Author(s):  
Roy J. Baerwald ◽  
Lura C. Williamson
Keyword(s):  
Blood Brain Barrier ◽  
Glial Cells ◽  
Tannic Acid ◽  
Nerve Cord ◽  
Ventral Nerve Cord ◽  
Florida Keys ◽  
Panulirus Argus ◽  
Brain Barrier ◽  
Cacodylate Buffer ◽  
Nerve Cords

In arthropods the perineurium surrounds the neuropile, consists of modified glial cells, and is the morphological basis for the blood-brain barrier. The perineurium is surrounded by an acellular neural lamella, sometimes containing scattered collagen-like fibrils. This perineurial-neural lamellar complex is thought to occur ubiquitously throughout the arthropods. This report describes a SEM and TEM study of the sheath surrounding the ventral nerve cord of Panulirus argus.Juvenile P. argus were collected from the Florida Keys and maintained in marine aquaria. Nerve cords were fixed for TEM in Karnovsky's fixative and saturated tannic acid in 0.1 M Na-cacodylate buffer, pH = 7.4; post-fixed in 1.0% OsO4 in the same buffer; dehydrated through a graded series of ethanols; embedded in Epon-Araldite; and examined in a Philips 200 TEM. Nerve cords were fixed for SEM in a similar manner except that tannic acid was not used.

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