Abstract
Changes in the fiber-diameter spectrum were observed at the intracranial and intraorbital portions of the developing rat optic nerve. From these measurements, the “area” of myelin was calculated and found to be consistently greater at the intracranial end. In the young adult animals, the weight of the residue after lipid extraction did not significantly differ in the two halves of the nerve. The weight of the lipid-soluble fraction and of cholesterol concentration in these animals at the two sites was significantly higher at the intracranial site. The rate of 14C-acetate incorporation in vitro into the cholesterol fraction was significantly higher in the intraorbital half of the nerve. These observations have been discussed in the context of myelination.
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