Axo|dendritic and axo|somatic synapses between BDA anterogradely labeled terminals and dendrites or cell bodies of the HRP retrogradely labeled neurons within the PBN were observed under the electron microscope.

• 电镜下在臂旁核内可见 ,Vc向臂旁核投射的 BDA顺标纤维和终末与臂旁核向丘脑 VPM投射的 HRP逆标神经元形成以非对称性为主的轴 -树和轴 -体突触。