Effects of stimulating the periaqueductal gray matter on high- and low-threshold startle reflexes

Autor:	Gokin Ap, Yu. P. Limanskii, M. V. Karpukhina
Rok vydání:	1989
Předmět:	CATS Physiology business.industry Chloralose General Neuroscience Withdrawal reflex Stimulation Peripheral chemistry.chemical_compound Nociception nervous system chemistry Moro reflex Reflex Medicine business Neuroscience
Zdroj:	Neurophysiology. 21:61-67
ISSN:	1573-9007 0090-2977
DOI:	10.1007/bf01059104
Popis:	The effects of stimulating the periaqueductal gray matter (PAG) on two types of startle reflex (spino-bulbo-spinal reflex produced by intensive stimulation of the peripheral nerves and low-threshold tactile spino-reticulo-spinal reflex) as well as high-threshold jaw-opening reflex arising in response to tooth pulp stimulation were investigated in cats anesthetized with chloralose. Simulating most PAG test sites led to pronounced inhibition of jaw-opening reflex, profound depression of spino-bulbo-spinal reflex, and moderate inhibition of tactile reflexes. The facilitatory effect of stimulating a number of PAG sites on the latter reflexes was demonstrated. Effects of PAG stimulation fell into two classes: brief, measurable in hundreds of msec and more prolonged, measured in minutes and seconds. Findings would indicate certain differences between the effects of PAG stimulation low-threshold (non-nociceptive) and high-threshold (nociceptive) startle reflexes, of which the possible mechanisms are discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bcc064b3c80a8c2f3b4bc51c0a4a74d0 https://doi.org/10.1007/bf01059104 Zobrazit plný text záznamu Full text from SpringerLink