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Variability of axonal arborizations hides simple rules of construction: A topological study from HRP intracellular injections

Intracellular staining with horseradish peroxidase (HRP) allows the analysis of the extent and diversity of axonal field, as the Golgi techniques did for dendritic fields. In this study, we have used such HRP injections to investigate possible rules of construction that underlie the variability in the observed morphological patterns of axons. The Mauthner cell of the teleost provides a suitable material for such a work since it receives inhibitory inputs from two distinct classes of cells that can be identified physiologically prior to their intracellular staining: those that contribute to a recurrent collateral network and those that are part of the commissural vestibuloves‐tibular pathway. The distribution of their terminal boutons over the M‐cell surface was quantified and their axonal arborizations were analyzed topologically with the help of a centripetal method of terminal ordering.