Flexor digitorum superficialis

The flexor digitorum superficialis muscle is an extrinsic muscle in the fingers at the interphalangeal joints. The muscle is located in the front part of the forearm. In some cases it is considered as the innermost part of the top layer of this anterior compartment, but in some other cases it may be a distinctive, intermediate layer in the anterior compartment. In many cases, this muscle may be absent from the little finger, which may result in problems with the diagnosis of an injury of the little finger. This muscle is divided into two distinct heads: the radial and humeroulnar. The ulnar artery and the median nerve travel through these two heads. The ulnar ligament of the elbow partly originates from this muscle. Four tendons arise from this muscle close to the wrist and pass via the carpal tunnel. The key function of the flexor digitorum superficialis muscle is to facilitate flexion between the middle phalanges at the interphalangeal joints of the fingers. Continuous action of the muscle also causes flexion of the metacarpophalangeal joints.
Written and medically reviewed by the Healthline Editorial Team
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In Depth: Flexor digitorum superficialis

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