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Fig. 4. Innervation does not control eye muscle differentiation and
specification. Internal views of HH20 bisected chick heads; anterior to
the top, dorsal to the left in A and right in B. Embryo stained
for Paraxis expression (blue); nervous system traced with RMO270 in
brown. (A) Unoperated control side. Note the abducens nerve (cranial nerve VI)
with nerve rootlets in rhombomeres 5 and 6 (arrowheads) and axons having
entered the Paraxis domain (arrow). (B) Rhombomeres 5/6 ablated side.
The abducens nerve is missing (open arrowhead), but Paraxis is
expressed normally. Scale bar: 200 µm. r, rhombomere; VI, abducens
nerve.