Results 201 to 210 of about 204,651 (234)
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From nerve net to nerve ring, nerve cord and brain — evolution of the nervous system
Nature Reviews Neuroscience, 2015The puzzle of how complex nervous systems emerged remains unsolved. Comparative studies of neurodevelopment in cnidarians and bilaterians suggest that this process began with distinct integration centres that evolved on opposite ends of an initial nerve net.
Heather Marlow +2 more
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1991
Abstract By the middle of the nineteenth century, the task of understanding the nerve cell as a cellular unit depended on answering several questions: (1) how do axis cylinders arise from nerve cells? (2) what is the extent and significance of the pale branched processes of nerve cells?
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Abstract By the middle of the nineteenth century, the task of understanding the nerve cell as a cellular unit depended on answering several questions: (1) how do axis cylinders arise from nerve cells? (2) what is the extent and significance of the pale branched processes of nerve cells?
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Changes in conduction velocity within a nerve net
Journal of Neurobiology, 1974AbstractConduction velocity within the through‐conducting nerve net of the sea anemone Calamactis praelongus is altered as a result of the passage of one or more impulses. Facilitation of conduction velocity occurs when the second evoked impulse follows the first by less than 2 sec.
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Control of Luminescence in Hemichordates and Some Properties of A Nerve Net System
Journal of Experimental Biology, 1964ABSTRACT Luminescence in Ptychodera and Balanoglossus is normally neurally mediated. The main luminescence appears to be intracellular; in addition a luminous slime is secreted. The response of individual photocytes is all-or-none, but requires neuroeffector facilitation which grades intensity by recruitment (in contrast to crustacean ...
Peter E. Pickens, C. H. Baxter
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Nerve net formation in the primitive nervous system of Hydra — an overview
Neuroscience Research Supplements, 1990Nerve net formation was examined during head-regeneration and budding of Hydra using indirect immunofluorescence on whole mounts. The nerve net was visualized with an antiserum to a neuropeptide, RFamide. The nerve net forms in two steps: the first is the appearance of ganglion cells at the regenerating tip, and the second is the appearance of sensory ...
Hans R. Bode +3 more
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Action potential in neurons of motor nerve net of Cyanea (Coelenterata)
Journal of Neurophysiology, 1983Neurons of the motor nerve net of the jellyfish Cyanea were impaled with microelectrodes for intracellular recordings. The cells have conventional, negative resting potentials and produce variable-amplitude action potentials with complex waveforms.
W. E. Schwab, P. A. Anderson
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Large Artificial Nerve Net (LANNET)
IEEE Transactions on Military Electronics, 1963This report describes the implementation of a high speed self-organizing system based on the reinforcement principle. The self-organizing binary logical network is used as the primary component in the system. The learning system is a 1024 decision element netwolk with a general purpose program to enable the operator to simulate a large number of ...
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Structure, development, and maintenance of the nerve net of the body column in hydra
The Journal of Comparative Neurology, 1996The anatomy and developmental dynamics of the nerve net in the body column of Hydra viridissima were examined immunocytochemically with a monoclonal antibody (CC04) that recognizes an antigen in nerve cells and with an antiserum against vasopressin. CC04+ neuron cell bodies, their neurites, and vasopressin-like-immunoreactive (VLI+) neurites could be ...
A. Mizusina +2 more
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Neuroethology: Generating complex behavioral sequences with distributed nerve nets
Current Biology, 2023How are animals equipped with only diffusely distributed nerve nets able to generate complex behaviors? A new study in Hydra vulgaris proposes that a peptide-based 'wireless connectome' works in concert with two familiar network-coordinating mechanisms to generate the animal's remarkable somersault behavior.
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1978
A most important problem of brain physiology and embryology is the topic “can an apparently unorganized system of interconnected neurons develop of itself into a system of more orderly interconnected neurons?” The paper shows, by means of an example, that this can indeed occur and how.
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A most important problem of brain physiology and embryology is the topic “can an apparently unorganized system of interconnected neurons develop of itself into a system of more orderly interconnected neurons?” The paper shows, by means of an example, that this can indeed occur and how.
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