A specialized neuron projection which is the site of synaptic transmission produced by retinal rod cells. Rod spherules are small round enlargements of the axon (3-5 micrometers diameter) or even extensions of the cell body. [ http://www.ncbi.nlm.nih.gov/pubmed/26930660 ]
Synonyms: rod photoreceptor spherule rod cell spherule
This is just here as a test because I lose it