Introduction to the Posterior Commissure The posterior commissure, often abbreviated as PC, represents a substantial bundle of nerve fibers traversing the midline within the complex architecture of the brain. Anatomically, it is situated precisely within the region of the epithalamus, serving as a critical white matter tract connecting various nuclei primarily associated with ocular motor […]
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 […]
The medial rectus (MR) is a muscle located in the medial aspect of the orbit that is responsible for adduction of the eye. It is one of the extraocular muscles, along with the superior, inferior, and lateral rectus muscles, and the superior and inferior oblique muscles. The MR is innervated by the third cranial nerve […]