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Abstract
Small pieces of rat fetal brain stem containing immature dopaminergic substantia nigra neurons were grafted to the anterior eye chamber of thyroidectomized and control recipient rats, to elucidate the possible developmental dependence of these neuroblasts on thyroid hormones. Outgrowth of nerve fibers in sympathectomized irides was analyzed with Falck-Hillarp fluorescence histochemistry. Both total surface area of the irides innervated by the dopaminergic neurons, and the number and size of axon bundles were markedly reduced in the experimental groups. This strongly suggests a role for thyroid hormones during fiber formation by the developing dopaminergic neurons of substantia nigra.
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