A Unique Variation of Flexor Digitorum Superficialis Muscle and Its Clinical Significance

Anatomical variations of the flexor digitorum superficialis (FDS) muscle are uncommon and is related to evolution of muscle from amphibians to human. These variations are of academic interest and should be considered when facing variations in clinical examination, interpreting radiological images and in surgical procedures such as tendon graft.We report a case of unilateral variation of FDS muscle in the forearm with two muscle bellies: superficial and deep which has not been reported before. The humeroulnar and radial origins of the superficial belly united to form a single muscle belly, which divided in the upper part of forearm into two tendons, that passed through carpal tunnel and inserted into the middle phalanges of third and fourth digits.The deep belly originated from medial epicondyle of the humerus next to flexor carpi ulnaris, continued as a short tendon in the upper part of forearm and then formed a second muscle belly in the middle third of the forearm (two muscle bellies separated by an intermediate tendon). In the lower part of forearm deep muscle belly divided into two tendons which traversed the carpal tunnel and was inserted into middle phalanx of second and fifth digits.The report enhances the knowledge on variation of FDS and add a note to understand atypical findings on physical examination and during surgery.

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“…Most of them are cadaveric findings (2,3,4,5,6,7,8). Some are incidental asymptomatic finding during surgery (9,10,11).…”

Section: Introductionmentioning

confidence: 99%

A unique anatomical variation of flexor digitorum superficialis muscle: a cadaveric case report

Udhayakumar

Nilojan

Ketheeswaran

et al. 2021

Sri Lanka Anat. Jnl

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“…9 Anita et al have reported a bilateral case of accessory belly of FDS; but in both sides the bellies rejoined the original tendon of FDS to index finger. 18 D'Costa et al have described an accessory belly replacing the tendon of FDS to index finger. 19 …”

Section: Variations Of Fdsmentioning

confidence: 99%

Accessory belly of flexor digitorum superficialis - case report of a rare variant

et al. 2015

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A combined variation of Palmaris longus and Flexor digitorum superficialis: Case report and review of literature

2016

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A Unique Variation of Flexor Digitorum Superficialis Muscle and Its Clinical Significance

Cited by 5 publications

References 13 publications

A unique anatomical variation of flexor digitorum superficialis muscle: a cadaveric case report

A unique anatomical variation of flexor digitorum superficialis muscle: a cadaveric case report

Accessory belly of flexor digitorum superficialis - case report of a rare variant

A combined variation of Palmaris longus and Flexor digitorum superficialis: Case report and review of literature

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