[Endoscopic Anatomy of the Inferior Orbital Fissure-Müller’s Muscle Structural Unit at the Medial Sellar Orbital Junction and its surgical relevance].

Background: Diseases of the orbit represent a surgical challenge, particularly those compromising the orbital apex. Optimal surgical access should provide the best possible exposure, allowing to identify certain key anatomical structures, called landmarks.

Objective: Describe the endoscopic anatomy of the structural unit formed by the Inferior Orbital Fissure (IOF) and the Müller’s muscle (MM) at the orbital apex (OA), thus generating a new endoscopic anatomical landmark.