Introduction to the Oculomotor Nerve (Cranial Nerve III) The Oculomotor Nerve, commonly designated as the third cranial nerve (CN III), represents one of the most critical components of the efferent visual system, governing the majority of extraocular muscle movements and playing an indispensable role in the regulation of pupillary diameter and lens accommodation. It is […]
Introduction and Nomenclature The Iritic Reflex, though a less commonly used descriptor, is scientifically synonymous with the Pupillary Light Reflex (PLR). This involuntary neurological mechanism governs the constriction and dilation of the pupil in response to changes in light intensity. The term “iritic” derives directly from the iris, the pigmented structure of the eye responsible […]
Definition and Basic Mechanism of Miosis Miosis, often interchangeably referred to as myosis, is defined fundamentally as the physiological or pathological contraction of the pupil of the eye, resulting in a reduction of the pupil’s diameter. This process is crucial for regulating the amount of light entering the eye, thereby protecting the delicate photoreceptors of […]