THE VARIATIONS IN THE SYSTEM OF THE TRUNKS OF THE POSTERIOR CILIARY ARTERIES

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Abstract
The ophthalmic artery bends around and then crosses the optic nerve. The angle of this bend varies with age. It is acute for the first 24 yrs., a right angle from 25-39 yrs., and obtuse after 40 yrs. At the bend, the artery is firmly attached to the optic nerve, and therefore this region remains fixed despite the pulse wave. The long posterior ciliary arteries and the central retinal artery usually arise from that portion of the ophthalmic artery which lies proximal to the bend, and they receive their column of blood in a direct line. As a result of this condition, anastomoses and accessory branches are found associated with these posterior ciliary arteries which permit some of the blood in the ophthalmic artery to bypass the bend. There is also very often in these cases an increase in the number of the short posterior ciliary arteries.[long dash]K. C. Wybar.

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