The chronoinotropic effects of new regulatory input to the heart of land pulmonates.
The postjunctional potentials and chronoinotropic reactions of the heart evoked by activation of multimodal neurons and/or left pallial nerve were investigated in three species of land pulmonates: Achatina fulica Ferrussac, Helix lucorum L., Arianta arbustorum L. Both spikes of giant homologous neurons (d-VLN, d-RPLN by A. fulica, command neurons of pneumostoma LPa3, RPa3 by H. lucorum) and stimulation of the peripheral end of the left pallial nerve evoked the similar biphasic inhibitory-excitatory junction potentials in the heart, in mantle muscles and in different parts of visceral complex. The positive chronoinotropic effects of this input in the hearts of whole-mount preparations were modified due to interaction with well-known neural cardioregulating network of the system of intestinal nerve.
Zhuravlev
V
V
Department of General Physiology, Saint Petersburg University, Russia. zhuravl@fnii.pu.ru
Bugaj
V
V
Safonova
T
T
Senkov
O
O
Kodirov
S
S
D000200:Action Potentials; D000818:Animals; D002909:Chronobiology Phenomena; D006321:Heart / Q000294:innervation / Q000502:physiology*; D009200:Myocardial Contraction / Q000502:physiology; D009474:Neurons / Q000502:physiology; D012908:Snails / Q000502:physiology*; D013045:Species Specificity