Visual pathway Neural path starting in the photoreceptors of the retina and travelling through the following structures: the optic nerve, the optic chiasma, the optic tract, the lateral geniculate bodies, the optic radiations and the visual cortex where the pathway ends. This pathway is occasionally made use of in cyclodialysis.

Prostaglandin drugs reduce the intraocular pressure by increasing the outflow through the uveoscleral pathway. The amount of aqueous outflow through this route amounts to between 10% and 15%, the rest flows out through the conventional pathway via the trabecular meshwork and into Schlemm's canal.

The fluid is believed to escape the eye via veins in the ciliary muscle and anterior choroid. The aqueous passes from the anterior chamber across the iris root through small spaces between the ciliary muscle fibres into the supraciliary space and suprachoroid space. Uveoscleral pathway An unconventional route through which the aqueous humour drains out of the eye. See blind sight pupillary fibres pupil light reflex pretectum. It is involved in the involuntary blink reflex to a dazzling light and in the eye movements occurring in response to the sudden appearance of a novel or a threatening stimulus. The nervous pathway between the retina and the superior colliculus. It is involved in the pupillary light reflexes. The nervous pathway connecting the retina to the pretectal region (anterior to the superior colliculi) and from there to the Edinger-Westphal nucleus. Parvocellular pathway See parvocellular visual system. Motor pathway Pathway from the cortex to the muscles that control the movements of the eyes enabling them to act as a unit. Magnocellular pathway See system, magnocellular visual. Some authors consider this term to be a synonym of visual pathway. Geniculocalcarine pathway See optic radiations.

Free Pathway