Maeda M, Takagi H, Kubota Y, Morishima Y, Akai F, Hashimoto S, Mori S
Brain Res. 1985 Mar 11;329(1-2):356-9. doi: 10.1016/0006-8993(85)90550-5.
The present study demonstrates synaptic contacts between vasoactive intestinal polypeptide (VIP)-like immunoreactive neurons and immunoreactive axon terminals in the submucous and myenteric plexuses of the rat small intestine. Our observations suggest that VIP afferents directly affect the VIP neurons in the small intestine via synapses.