VASOMOTOR FIBERS IN RETINAL, CHOROIDAL AND CILIARY ARTERIES

Abstract

Using direction observation with a Bausch and Lomb electric ophthalmoscope, the following results were noted. Intravenous injection of adrenalin hydrochloride (1-5000) or nicotin produces in the choroid of dogs and rabbits marked constriction of the arteries with a flushing of the veins; the same results were noted for the retinal arteries. Using a slit lamp and observing the ciliary vessels of the albino rabbit, the same results were noted as for the choroidal vessels. Stimulation of the cephalic end of the sympathetic nerve produces a marked constriction of all 3 sets of arteries. These observations show conclusively that the retinal, choroidal, and ciliary arteries have definite vasoconstrictor fibers in the cervical sympathetic nerve.