Nociceptive pressor reflexes and nerve impulse activity in response to intradermal injection of potassium chloride in cats

1971 ◽  
Vol 72 (2) ◽  
pp. 850-852
Author(s):  
G. I. Malysheva ◽  
A. V. Zeveke ◽  
V. L. Shaposhnikov ◽  
V. K. Chigin
Keyword(s):  
Potassium Chloride ◽  
Impulse Activity ◽  
Nerve Impulse ◽  
Intradermal Injection ◽  
Pressor Reflexes

Activation of Medullary Neurons by Noxious Stimuli Applied to the Teeth

1972 ◽  
Vol 51 (2) ◽  
pp. 577-582 ◽  
Author(s):  
Neal C. Miller ◽  
Jack G. Bishop ◽  
Homer L. Dorman
Keyword(s):  
Potassium Chloride ◽  
Trigeminal Nerve ◽  
Negative Pressure ◽  
Impulse Activity ◽  
Nerve Impulse ◽  
Firing Frequency ◽  
Electric Shocks ◽  
Before And After ◽  
Noxious Stimuli ◽  
Medullary Neurons

Nerve impulse activity was recorded from the descending tract of the trigeminal nerve before and after application of certain noxious stimuli to the exposed dentin of teeth. Heat, electric shocks, concentrated potassium chloride solutions, and negative pressure increased the firing frequency of a majority of the neurons monitored.

The multiple factors determining retinotopic order in the growth of optic fibres into the optic tectum

1977 ◽  
Vol 278 (961) ◽  
pp. 261-276 ◽  
Keyword(s):  
Optic Tectum ◽  
Nervous Tissue ◽  
Large Scale ◽  
Ganglion Cells ◽  
Impulse Activity ◽  
Nerve Impulse ◽  
Retinal Ganglion ◽  
Optic Nerve Fibre ◽  
Cells Of Origin ◽  
Lower Vertebrates

Evidence is presented to support the conclusion that normally functioning optic nerve fibre terminal arborizations are open to continuous modification of their location and that they are capable of large scale gradual movement across the optic tectum in lower vertebrates. The termination of optic fibres at precisely defined tectal locations during normal embryonic development does not appear, in view of this and other evidence, to be due to any restrictions imposed by specializations distinguishing terminal sites themselves. However, there is clear evidence that, on the basis of possibly very simple specializations acquired as part of their embryological origin at particular locations in the retina, growing optic fibres actively and continuously select specific routes to be followed through intervening nervous tissue which eventually lead them to predictable and at least approximately appropriate terminal regions in the tectum. It is proposed that terminals move into and maintain fully retinotopic order as a result of direct interactions between fibres themselves based on features correlated with the retinal proximity of their cells of origin. This may involve further use of specializations due to related embryological origin: correlations in nerve impulse activity among neighbouring retinal ganglion cells may serve to stabilize most favourable terminal combinations. It is argued that fibres are subject to multiple influences which contribute to their orderly growth and that the demands made on the embryological differentiation of nervous tissue can thereby be considerably reduced.

Does nerve impulse activity modulate fast axonal transport?

1992 ◽  
Vol 6 (2-3) ◽  
pp. 191-201 ◽  
Author(s):  
Richard Hammerschlag ◽  
Judy Bobinski
Keyword(s):  
Axonal Transport ◽  
Impulse Activity ◽  
Nerve Impulse ◽  
Fast Axonal Transport

Tentacle autotomy in the hydromedusa Aglantha digitale (Cnidaria): an ultrastructural and neurophysiological analysis

1991 ◽  
Vol 331 (1260) ◽  
pp. 155-170 ◽  
Keyword(s):  
Tensile Strength ◽  
Cell Membrane ◽  
Basal Cell ◽  
Impulse Activity ◽  
Nerve Impulse ◽  
Conduction System ◽  
Strong Contraction ◽  
Structural Weakness ◽  
Excess Mg ◽  
Active Processes

Tentacles of the hydromedusa Aglantha digitate readily detach (autotomize) at a predictable site (autotomy plane) when a tentacle is pinched and tugged. The response is reversibly inhibited in seawater containing excess Mg 2+ . Behavioural, electrophysiological and ultrastructural analyses indicate that passive and active processes are involved in tentacle autotomy. Inherent structural weakness at the tentacle autotomy plane is suggested by thinning of mesoglea and reduction of muscle tails at this site. The autotomy plane is also characterized by a ring of distinctive ectodermal cells with vacuoles concentrated along the basal cell membrane bordering the mesoglea. These vacuolated autotomy plane (VAP) cells are extensively innervated and, except for a few slender muscle tails, they interrupt the sheath of myoepithelium encasing each tentacle. Tentacles fixed after an autotomizing stimulus but before tentacle breakage show loss of basal vacuoles in VAP cells and holes in the underlying mesoglea. We suggest that the active mechanisms for tentacle autotomy include strong contraction of muscle tails on either side of the autotomy plane and activation of VAP cells, which somehow lower the tensile strength of autotomy plane mesoglea. Autotomizing stimuli do not appear to evoke a special conduction system within the tentacle. Highfrequency nerve-impulse activity in the tentacle conduction system that otherwise directs graded tentacle contractions is initiated by autotomizing stimuli and precedes tentacle disjunction. Tentacle autotomy in Aglantha , a delicate holopelagic hydromedusa that inhabits densely populated pelagic zones, may allow escape when the tentacles inadvertently entangle and overly large and potentially damaging zooplankters.

A comparison between different models of the relation between recorded intradental nerve impulse activity and reported pain in man

1989 ◽  
Vol 24 (1) ◽  
pp. 17-28 ◽  
Author(s):  
Uno G.H. Fors ◽  
Hans H. Sandberg ◽  
Lennart G.A. Edwall ◽  
Glenn A.T. Haegerstam
Keyword(s):  
Impulse Activity ◽  
Nerve Impulse

Evaluation of a mathematical model analysing the relation between intradental nerve impulse activity and perceived pain in man

1986 ◽  
Vol 19 (3-4) ◽  
pp. 261-277 ◽  
Author(s):  
Uno G.H. Fors ◽  
Michael L. Ahlquist ◽  
Lennart G.A. Edwall ◽  
Glenn A.T. Haegerstam
Keyword(s):  
Mathematical Model ◽  
Impulse Activity ◽  
Nerve Impulse ◽  
Perceived Pain
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