We have been puzzling over the following:
Why is contralateral innervation so prominent and conserved a
feature of the chordate nervous system? What is the functionality of this
feature in the "higher" vertebrates? How does one explain the exceptions
to this general rule, e.g. bilateral innervation of the upper half of the
face in man (contrasted with largely unilateral innervation of the lower
face)?
Can anyone suggest any answers, or references where answers might
be found?
