Henry Gray (18251861). Anatomy of the Human Body. 1918. WHITE
SUBSTANCE.(1) The origin and course of the superior peduncle
have already been described (page 792). (2) The medial
(posterior) longitudinal fasciculus is continuous below with the
proper fasciculi of the anterior and lateral funiculi of the
medulla spinalis. In the medulla oblongata and pons it runs
close to the middle line, near the floor of the fourth
ventricle; in the mid-brain it is situated on the ventral aspect
of the cerebral aqueduct, below the nuclei of the oculomotor and
trochlear nerves. Its connections are imperfectly known, but it
consists largely of ascending and descending intersegmental or
association fibers, which connect the nuclei of the hind-brain
and mid-brain to each other. Many of the fibers arise in
Deiterss nucleus (lateral vestibular nucleus) and divide into
ascending and descending branches which send terminals and
collaterals to the motor nuclei of the cranial and spinal
nerves. Its spinal portion is located in the ante