In article <31FB0873.21F4 at clubi.ie> Trial Account <ph606267 at clubi.ie> writes:
>The trochlear nerve is the only cranial nerve to decussate in the brain-
>stem and emerge from its dorsal aspect.
This isn't quite true. The innervation of the superior rectus muscle
comes from the contralateral oculomotor nucleus, with the axons
decussating before they enter the III nerve. The levator palpebrae
superioris muscle is said to receive both ipsi- and contralaterally
derived innervation. See A. Brodal's "Neurological Anatomy" for
thorough discussion.
John A. Kiernan
Department of Anatomy
Univ. of Western Ontario
LONDON, Canada N6A 5C1
e-mail: kiernan at uwo.ca