Two lateral branches from the dorsalis pedis artery supply the extensor brevis muscle: the lateral tarsal artery and the artery to extensor hallucis brevis, respectively. The muscle is innervated by a branch of the deep peroneal nerve. Innervation: A muscle flap approximately 4 by 5 or 6 centimeters.
It is not usually taken with a skin paddle since the muscle lies deep to the long extensor tendons of the foot. Figure 1. Example of extensor digitorum brevis manus muscle white arrows found during surgery of the left hand. For reference, note the tendon of the extensor carpi radialis longus muscle black arrow. Review Embryology The precursor muscle that gives rise to the extensors of the forearm differentiates into superficial, deep, and radial portions. Comparative anatomy and variants Although there are variants, multiple studies have reported the most common origin for the EDBM to be inside the radiocarpal joint capsule, attaching either to the dorsal metacarpal surface, the distal end of the radius, or the proximal portion of the radiocarpal ligament [ 3 , 8 - 9 ].
Clinical significance While the EDBM can be found incidentally during surgery or in a cadaveric dissection, few cases have involved patients reporting symptoms prior to the discovery of this anomaly of a dorsal hand muscle.
Footnotes The authors have declared that no competing interests exist. References 1. De extensore digitorum brevis manus. Albinus BS. Academicarum Annotationum.
Macalister A. Dublin: Royal Irish Academy; Yammine K. Surg Radiol Anat. A case of extensor indicis brevis manus muscle. Chir Ital. Wood FJ. The Principles of Anatomy as Seen in the Hand, 2nd ed. London: Bailliere, Tindall and Cox; The morphology of the extrinsic muscles; pp. The extensor digitorum brevis manus.
Souter WA. Br J Surg. Surgery of intrinsic muscles of the hand other than those producing opposition of the thumb. Bunnell S. Extensor tendons of the fingers: arrangement and variations-II. Clin Anat. Anatomic and clinical studies of the extensor digitorum brevis manus. J Hand Surg Am. A study on the extensor digitorum brevis manus muscle in man.
Kaibogaku Zasshi. Extensor digitorum brevis manus: a report on 38 cases and a review of the literature. Gama C. Extensor digitorum brevis manus in the non dominant hand of two brothers. IMAIOS and selected third parties, use cookies or similar technologies, in particular for audience measurement. Cookies allow us to analyze and store information such as the characteristics of your device as well as certain personal data e.
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The cookies collect information in a way that does not directly identify anyone. For more information on how these cookies work, please see our 'Cookies page'. Interesting information The extensor digitorum brevis can act as a trigger point for foot pain, although this may overlap with pain from the tibialis anterior and peroneus terius.
Origin Upper and lateral surface of calcaneus, in front of groove for peroneus brevis, from interosseous talocalcaneal ligament, stem of inferior extensor retinaculum. Insertion Four tendons extending into the proximal phalanx of the big toe and long extensor tendons to toes 2, 3 and 4. Function The function of the extensor digitorum brevis is to extend or straighten the middle three toes when the foot is fully dorsiflexed. Nerve supply Deep peroneal nerve.
Blood supply Dorsalis pedis artery. Relevant research A study demonstrated the efficacy of the extensor digitorum brevis muscle flap in covering defects of the distal tibia and malleoli as an island muscle flap. Start your free trial today!
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