“…For example, we now know that sub-populations of raphe-, vestibulo-, rubro-and reticulospinal neurons have axons or collaterals that terminate in both the cervical and lumbar spinal enlargements (Wolstencroft, 1964;Abzug et al, 1974Abzug et al, , 1973Peterson et al, 1975;Huisman et al, 1981;Manaker et al, 1992) and that many of the reticulospinal neurons innervating both enlargements do so at multiple cervical and lumbar segmental levels (Takakusaki et al, 1994;Kakei et al, 1994). In addition, Giovanelli Barilari and Kuypers (1969) compared the terminal distributions of long propriospinal fibers interconnecting the enlargements with those of various descending supraspinal pathways and found substantial overlap with reticulospinal fibers along with a significant but more varied overlap with terminals of vestibulo-, tecto-, and interstitiospinal fibers.…”