motivating, organizing principle, the decussation
, or X-shaped
The racecourse of that name is actually situated some three miles east, on the northern side of the Rolleston level-crossing, a decussation
known to all who have visited the track.
The ipsilateral paresis is due to the compressive forces and resultant damage occurring at the level of the contralateral peduncle and proximal to decussation
at the medulla (Kernohan & Woltman, 1929).
This is because birds, unlike mammals, have complete decussation
of the optic nerve fibers at the optic chiasm to the contralateral area pretectalis.
This is because of complete decussation
of the optic nerve fibers at the optic chiasm and then again between the pretectal nucleus and the parasympathetic nucleus of cranial nerve III.