An endosome present in the presynapse that fuses with endocytic vesicles arising in the presynaptic endocytic zone. This organelle is believed to be involved in regeneration of synaptic vesicles. [ http://www.ncbi.nlm.nih.gov/pubmed/25939282 http://www.ncbi.nlm.nih.gov/pubmed/20200227 ]
Term information
goslim_synapse
As of 2015, there is still controversy over the nature of presynaptic endosomes and their relationship to regular endosomes. See Jahne et al., 2015 (PMID:25939282) for details.