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Features of myoneural junctions in the extraocular muscles of the opossum (Didelphis albiventris).

The myoneural junctions present in the opossum (Didelphis albiventris) extraocular muscles were studied through histochemical and ultrastructural techniques. Three different types of junction were shown: two single types, 'en grappe' and 'en plaque', present in the middle third of the muscle fibers; and one multiple type, more rare and observed in the distal third of the muscle.