axon synapses in synapsed by retinal rod cell cone retinal bipolar cell type 3 cone bipolar cell (sensu Mus) An OFF-bipolar neuron found in the retina and having connections with cone photoreceptors cells and neurons in the outer half of the inner plexiform layer. The dendritic tree is delicate and the dendritic tips appear small when compared with type 1 cells. The axon terminal is stratified and restricted to sublamina 2 of the inner plexiform layer. DB2 cone bipolar cell sublaminar layer S2