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. 2023 Mar 13;243(2):284–296. doi: 10.1111/joa.13860

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© 2023 The Authors. Journal of Anatomy published by John Wiley & Sons Ltd on behalf of Anatomical Society.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Isolated specimens of the SM, ST, BFlh, and BFsh. (a, a’) SM in the superficial surface (a) and deep surface (a'). The slender extramuscular origin tendon (exOT) outside of the muscle continued to the membranous epimuscular origin tendon (epiOT) on the superficial lateral surface of the muscle. The membranous epimuscular insertion tendon (epiIT) spreads widely on the deep medial surface of the muscle and continues to the short extramuscular insertion tendon (exIT). The epimuscular origin tendon is subdivided into a thicker axial part and a thinner wing part at the boundary indicated by asterisks. (b, b') ST in the superficial surface (b) and deep surface (b'). The origin tendon of ST possesses no extramuscular part and extends shortly as the epimuscular origin tendon (epiOT) on the lateral surface of the muscle. The epimuscular insertion tendon (epiIT) on the medial surface of the muscle continued to a long string‐like extramuscular insertion tendon (exIT). (c, c’) BFlh in the superficial surface (c) and deep surface (c'). The slender extramuscular origin tendon (exOT) continues to the narrow band‐like epimuscular origin tendon (epiOT) on the deep surface. The epimuscular insertion tendon (epiIT) covers the superficial surface of the muscle and continues to the strap‐shaped extramuscular insertion tendon (exOT). (d, d') BFsh in the superficial surface (d) and deep surface (d'). The edge‐like proximal end of BFsh possesses no tendon attaching muscularly to the femur (aO); white arrowheads—attachment site of origin side. The thicker distal end of BFsh also possesses no tendon attaching to the deep surface on the extramuscular insertion tendon of BFlh (aI); red arrowheads—attachment site of insertion side. aO, attachment site of origin side; aI, attachment site of insertion side; epiIT, epimuscular insertion tendon; epiOT, epimuscular origin tendon; exIT, extramuscular insertion tendon; exOT, extramuscular origin tendon.