Clinical StudiesA Relationship Between the Supratrochlear Nerve and Trochlea Anatomical Study and Application to Migraine HeadachesKikuta, Shogo DDS, PhD*,†; Iwanaga, Joe DDS, PhD*,†,‡; Watanabe, Koichi MD, PhD‡; Kusukawa, Jingo DDS, PhD†; Tubbs, R. Shane PA-C, PhD*,§Author Information *Seattle Science Foundation, Seattle, WA †Dental and Oral Medical Center ‡Department of Anatomy, Division of Gross and Clinical Anatomy, Kurume University School of Medicine, Kurume, Fukuoka, Japan §Department of Anatomical Sciences, St. George's University, St. George's, Grenada, West Indies. Address correspondence and reprint requests to Joe Iwanaga, DDS, PhD, Seattle Science Foundation, 550 17th Ave, James Tower, Suite 600, Seattle, WA 98122; E-mail: firstname.lastname@example.org Received 4 April, 2019 Accepted 16 July, 2019 The authors report no conflicts of interest. Journal of Craniofacial Surgery: November-December 2019 - Volume 30 - Issue 8 - p 2497-2498 doi: 10.1097/SCS.0000000000005920 Buy Metrics Abstract Supratrochlear nerve (STN) is a terminal branch of the frontal nerve arising from the ophthalmic nerve (V1). Compression of the STN by adjacent structures might result in migraine headaches. The aim of this study was to explore the relationship of the STN and trochlea for a better understanding of potential entrapment of the STN. Nineteen orbits from ten fresh-frozen cadaveric heads were dissected. The relationship of the STN and the trochlea was classified into three types: In type I, the STN passed lateral to the trochlea; In type II, the STN passed through the trochlea; In type III, the STN passed medial to the trochlea. Type I was found in 52.6% (10/19 sides), type II was found in 42.1% (8/19 sides), and type III was seen in 3.4% (1/19 sides). In type III, both the STN and infratrochlear nerve were identified as separate branches. The authors propose a new classification of the pathway of the STN based on its relationship with the trochlea. This study might shed light on headaches emanating from this region. © 2019 by Mutaz B. Habal, MD.