Abstract
A variation of the flexor carpi radialis with an excessive muscular bundle was found on the right forearm of a Japanese male cadaver. The flexor carpi radialis had two heads, medial one arising from the medial epicondyle of the humerus, and the other, a variant excessive muscular bundle, arising from the bicipital aponeurosis deep at the medial edge of the tendon of biceps brachii. There was also a muscular slip between the pronator teres and lateral head of flexor carpi radialis. The insertion of the ending tendon of the flexor carpi radialis was also variant, which was not only inserted into the base of the second metacarpal bone, but into the proximal surface of the scaphoid and the tubercle of trapezium. The excessive muscular bundle might be a residual muscular slip which connects between the distal part of the biceps brachii and the initial part of the flexor carpi radialis during the early embryonic development.
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References
Bhat N, Bhat KMR, D'Souza AS, Kotian SR (2017) Additional muscle slip of bicipital aponeurosis and its anomalous relationship with the median cubital vein. Sultan Qaboos Univ Med J 17:e103–e105
Chong SJ, Al-Ani S, Pinto C, Peat B (2009) Bilateral flexor carpi radialis brevis and unilateral flexor carpi ulnaris brevis muscle: case report. J Hand Surg Am 34:1868–1871
Huang AH, Riordan TJ, Pryce B, Weibel JL, Watson SS, Long F, Lefebvre V, Harfe BD, Stadler HS, Akiyama H, Tufa SF, Keene DR, Schweitzer R (2015) Musculoskeletal integration at the wrist underlies the modular development of limb tendons. Development 142:2431–2441
Irie T, Motomiya M, Iwasaki N (2018) Absence of flexor carpi radialis identified during volar approach for fixation of distal radius fracture: a case report. BMC Res Notes 11:240
Joshi SD, Yogesh AS, Mittal PS, Joshi SS (2014) Morphology of the bicipital aponeurosis: a cadaveric study. Folia Morphol (Warsz) 73:79–83
Kardon G (1998) Muscle and tendon morphogenesis in the avian hind limb. Development 125:4019–4032
Kardon G, Harfe BD, Tabin CJ (2003) A Tcf4-positive mesodermal population provides a prepattern for vertebrate limb muscle patterning. Development 5(6):937–944
Kordahi AM, Sarrel KL, Shah SB, Chang EY (2018) Flexor carpi radialis brevis: case report of a symptomatic tear. Skeletal Radiol 47:1705–1708
Lee YM, Song SW, Sur YJ, Ahn CY (2014) Flexor carpi radialis brevis: an unusual anomalous muscle of the wrist. Clin Orthop Surg 6:361–364
Lewis WH (1902) The development of the arm in man. Am J Anat 1(2):145–183
Luong DH, Smith J, Bianchi S (2014) Flexor carpi radialis tendon ultrasound pictorial essay. Skeletal Radiol 43:745–760
Mimura T, Uchiyama S, Hayashi M, Uemura K, Moriya H, Kato H (2017) Flexor carpi radialis brevis muscle: A case report and its prevalence in patients with carpal tunnel syndrome. J Orthop Sci 22:1026–1030
Nayak SB, Swamy RS, Shetty P, Maloor PA, Dsouza MR (2016) Bifurcated bicipital aponeurosis giving origin to flexor and extensor muscles of the forearm—a case report. JCDR 10:AD01-02
Rumball KM, Tonkin MA (1996) Absence of flexor carpi radialis. J Hand Surg Br 21:778
Sammer DM, Chung KC (2009) Tendon transfers: part I Principles of transfer and transfers for radial nerve palsy. Plast Reconstr Surg 123(5):169e–177e
Schweitzer R, Chyung JH, Murtaugh LC, Brent AE, Rosen V, Olson EN, Lassar A, Tabin CJ (2001) Analysis of the tendon cell fate using Scleraxis, a specific marker for tendons and ligaments. Development 128(19):3855–3866
Sofos SS, Riaz M (2016) Absence of flexor carpi radialis during an elective carpometacarpal arthroplasty of the thumb: a rare anatomical variation. Case Rep Med 2016:7853487
Varadharajan V, Bhardwaj P, Sabapathy SR (2017) Absence of flexor carpi radialis: a rare anatomical variation with clinical significance. Indian J Plast Surg 50:111–112
Yavari M, Abdolrazaghi HA, Riahi A (2014) A comparative study on tendon transfer surgery in patients with radial nerve palsy. World J Plast Surg 3:47–51
Yoshida Y, Yasutaka S, Seki Y (1983) Studies on the flexor carpi radialis profundus and palmaris profundus. Acta Anat Nippon 58:59–67
Acknowledgements
The authors are grateful to the members of “Shiragiku-Kai” of Akita University Graduate School of Medicine for their dedicated supports and also stuff of the Medical Technology Center for their technical assistance. This work was supported by JSPS KAKENHI Grant number JP16K08435.
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Zhou, M., Ishizawa, A., Akashi, H. et al. An anomalous case of the flexor carpi radialis with an excessive muscular bundle. Anat Sci Int 95, 293–296 (2020). https://doi.org/10.1007/s12565-019-00519-w
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DOI: https://doi.org/10.1007/s12565-019-00519-w