A single axon terminal bouton making contact onto two or more dendritic spines protruding from the same dendrite.
Synonyms:
exact_synonym:
MSB1; type 1 multi-synapse bouton; type 1 multi-synaptic bouton; type 1 multiple spine synapse bouton; type 1 multiple-synapse bouton; type 1 multisynapse bouton; type 1 multisynaptic bouton