Journal of Applied Physiology AJP: Gastrointestinal and Liver Physiology
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J Appl Physiol 62: 1046-1056, 1987;
8750-7587/87 $5.00
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Journal of Applied Physiology, Vol 62, Issue 3 1046-1056, Copyright © 1987 by American Physiological Society

ARTICLES

Medullary inspiratory activity: influence of intercostal tendon organs and muscle spindle endings

D. C. Bolser, B. G. Lindsey and R. Shannon

Studies were conducted to determine the effects of intercostal muscle spindle endings (MSEs) and tendon organs (TOs) on medullary inspiratory activity in decerebrate and allobarbital-anesthetized cats. Impeded muscle contractions, elicited by electrical stimulation of the peripheral cut end of the T6 ventral root, were used to stimulate external and internal intercostal TOs without MSEs. Impeded contractions of either the external or internal intercostal muscles reduced phrenic and medullary inspiratory neuronal activities. Vibration was used to selectively stimulate external or internal intercostal MSEs (90 and 40 micron amplitude, respectively). Selective stimulation of either external or internal intercostal MSEs did not change phrenic or medullary inspiratory neuronal activities. It is concluded that both external and internal intercostal TOs have a generalized inhibitory effect on medullary inspiratory activity and intercostal MSEs have no effect on medullary inspiratory activity.


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