this paper concentrates on two aspects : 1 ) the synaptic complex between a retinula cell axon and four postsynaptic elements , arranged in a constant elongated array ( it is suggested that all synapses in which the retinula cell is presynaptic are of this kind ) , and 2 ) the `` '' gnarl '' '' complex in which a presynaptic specialization in one neuron is separated from another neuron by a complicated glial invagination .
C0039062
synapses
C0007634
cell