A bulbar relay to the centre median.

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Abstract
A region of the bulbar reticular formation (the part of the nucleus reticular is giganto cellular is lying dorsal to the rostral pole of the inferior olive) is shown to be a relay from spinal cord to the thalamic center median. The main spino-reticular pathway crosses the mid-line of the spinal cord at the segmental level and ascends in the anterolateral fasciculus. Functionally, the reticulo-centromedian pathway is principally uncrossed. Single unit recording in this region showed that all the cells could be activated by tapping: 60.5% responded to sound and 27% responded to a flash of light; 94.8% of the cells were activated from the whole surface of the body; 10% of the units investigated gave a second response at long latency. A small proportion were inhibited by peripheral stimulation.

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