Journal of Anatomy and Physiological Studies


Bilateral Anomalous Insertions of Fibularis Brevis: A Case Report

Author(s): Matthew J Schultz, DO, ATC, Wayne Ngo, Arpam Dutta, Cara L. Fisher, PhD

During a routine dissection of a 52-year-old male, atypical insertions of the fibularis brevis muscle were noted bilaterally. The fibularis brevis tendon most commonly inserts into the lateral aspect of the tuberosity at the base of the fifth metatarsal. Upon evaluation of the cadaver, an accessory band of the fibularis brevis tendon splitting into medial and lateral bands was noted on the right foot. The medial band inserted onto the fourth dorsal interosseous muscle, as well as the dorsal surface of the distal aspect of the fifth metatarsal. The lateral band was found to insert onto the dorsal aspect of the tuberosity at the fifth metatarsal distal to where the main band of the fibularis brevis tendon inserted. The left foot revealed a single accessory band of the fibularis brevis tendon that inserted onto the fourth dorsal interosseous muscle. Further examination also uncovered the fibularis digiti quinti tendon splitting from the fibularis brevis tendon at the level of the lateral malleolus and then emerging distally between the main and accessory bands of the fibularis brevis tendon before finally inserting onto the extensor aponeurosis of the fifth toe. This case report describes bilateral anatomical variations of fibularis brevis tendon insertion along with the unilateral presence of fibularis digiti quinti. While previous studies have been conducted regarding anatomical variability within fibularis brevis tendon insertions and fibularis digiti quinti presence, none have described or classified the two variations seen in our dissection. A detailed understanding of variable tendinous insertions along the lateral foot is important for physicians to successfully evaluate and treat patients with foot pain.

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