Bilateral accessory flexor muscle of the forearm giving rise to a variant head of the first lumbrical

Guiyun ZHANG; Bruce A. FENDERSON

Guiyun Zhang^* and Bruce A. Fenderson

¹ Department of Pathology, Anatomy and Cell Biology, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania, USA, Email: [email protected]

^*Correspondence: Guiyun Zhang, MD, PhD, Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, 1020 Locust Street Room 263, Jefferson Alumni Hall Philadelphia, PA 19107, USA, Tel: +1 (215) 503-7019, Email: [email protected]

Received: 18-Dec-2013 Accepted Date: Mar 12, 2014; Published: 05-Jan-2015

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Abstract

We describe a bilateral accessory deep flexor in the forearm that originated from the lateral side of the forearm. The relatively large tendon bifurcated distally to form two branches, one of which was associated with a variant head of the first lumbrical muscle. The presence of an accessory tendon and a variant muscle within the carpal tunnel may contribute to median nerve compression and development of carpal tunnel syndrome in some patients.