Six of the 12 cranial nerves (CN II–VII) directly innervate the eye and periocular tissues. Because certain tumors affecting CN I (the olfactory nerve) can give rise to important ophthalmic signs and symptoms, it is imperative that ophthalmologists be familiar with the anatomy of this nerve. Chapter 3 discusses CN I–VII in greater depth; also see BCSC Section 7, Oculofacial Plastic and Orbital Surgery, and Section 5, Neuro-Ophthalmology.
Excerpted from BCSC 2020-2021 series: Section 2 - Fundamentals and Principles of Ophthalmology. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.