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In this video we discussed about the light reflex pathway or pupillary light reflex pathway and lesions of this pathway. When light is shown to one eye, normally the pupils of both the eyes constrict. The constriction of pupil upon which the light is shown is termed direct light reflex and the constriction of the pupil of the other eye (even though no light fell upon that eye) is termed indirect or consensual light reflex.

Pathway of the reflex
Afferent limb: The visual impulses travel through the optic nerve, optic chiasma and optic tract to
terminate in the pretectal nucleus. Then the impulses from pretectal nucleus pass to the
parasympathetic nuclei (EdingerWestphal nuclei) of the IIIrd cranial nerve of both sides.
FIG.
Efferent limb: The impulses from the EdingerWestphal nucleus pass bilaterally along the
oculomotor nerve to the ciliary ganglion. The postganglionic parasympathetic fibres travel along the
short ciliary nerves to supply the sphincter pupillae muscle of the iris leading to constriction of pupils of the both eyes.


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Dr. Ankit Jain
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