The axo-dendro-dcndritic synapse (A D-D): The axon terminal A synapses with the dendrite D to form the axo-dendritic syn轴-树-树突触(A-D-D_):轴突终末A与Ⅱ型树突D形成轴-树突触(A-D);
The axo-axo-dendritic synapse (A-A-D): The axon terminal A synapses with the axon terminal A to form the axo-axonie syna轴-轴-树突触(A-A_-D):轴突终末A与轴突终末A_形成轴-轴突触(A-A_);