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In a previous paper in these ‘Proceeding’ (E. C. Hoff, 1932), a report was given of investigation concerning the boutons terminaux which constitute the terminals of nerve fibres around dendrites and perikarya in the central nervous system. It was shown that 24 to 48 hours after selection of the afferent roots of the spinal cord of the cat, the boutons undergo degenerative swelling and granulation. This degenerative process reaches a climax in 3 days and ends in the complete destruction of the terminals after 4 to 6 days.* In the present studies, the normal synapses of the monkey have been investigated; further, the phenomenon of degeneration of boutons following section of nerve fibres has been applied as a method for determining the endings of the pyramidal tracts in the cat and the monkey.

The distribution of the spinal terminals (boutons) of the pyramidal tract, determined by experimental degeneration