Abstract
Optic fibers were experimentally deflected from their normal courses in the ganglion cell fiber layer (GCFL) of the embryonic chick retina. Fibers deflected sclerad to the GCFL travelled randomly with no tendency to re-enter the GCFL. Fibers growing in the more sclerad portion of the GCFL travelled bidirectionally, i.e. either toward or away from the optic nerve, sometimes exiting through the retinal periphery. Fibers in the most vitread portion of the GCFL tended to grow unidirectionally, toward the optic nerve. The results indicate that the factors that steer optic fibers toward the optic nerve do not operate through the full thickness of the retina but are narrowly confined to the GCFL, possibly to its most vitread portion. The GCFL acts like a glue that entraps but does not attract optic axons.
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