FIRST we will study the macroscopic or extra-tissular, and afterwards the microscopic or intra-tissular vascularization of the primary optic pathways. The latter has been especially studied by microradiographic examination of sections 0O1-0-5 mm. thick after injecting Heyden's thorotrast. (A) MACROSCOPIC (EXTRA-TISSULAR) VASCULARIZATION OF THE PRIMARY OPTIC PATHWAYS The central retinal artery, though making use of the optic nerve to reach the retina, supplies only the latter.
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