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Double-bellied superior rectus muscle

  • Anatomic Variations
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Abstract

Congenital variations of extraocular muscles are rare. We report a double-bellied superior rectus muscle, observed in an adult male cadaver aged 70 years. The superior rectus muscle had two equal-sized bellies, which took separate origins from the common tendinous ring and united to form a common belly 1 cm before the insertion. Due to the duplication, the muscle extended laterally beyond the levator palpebrae superioris. Both its bellies were supplied by oculomotor nerve. To the best of our knowledge, this is the first report on doubling of the belly of the superior rectus muscle.

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Acknowledgements

The authors deeply acknowledge the help rendered by the management of the Institute and the supporting staff of the dissection hall in carrying out this research. The authors also acknowledge the contribution of Dr. Devadasa Shetty in preparation of the schematic diagram.

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Authors and Affiliations

  1. Melaka Manipal Medical College (Manipal Campus), Manipal Academy of Higher Education, Madhav Nagar, Manipal, Karnataka, 576104, India

    Satheesha B. Nayak, Surekha D. Shetty, Naveen Kumar & Ashwini P. Aithal

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  1. Satheesha B. Nayak
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  2. Surekha D. Shetty
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  3. Naveen Kumar
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  4. Ashwini P. Aithal
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Contributions

SBN dissected the cadaver. He also took the photograph and labeled it and drafted the manuscript. SDS, NK, and AA helped in reviewing the literature, proof reading the manuscript, and final approval.

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Correspondence to Satheesha B. Nayak.

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All authors declare that they have no conflict of interest.

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Nayak, S.B., Shetty, S.D., Kumar, N. et al. Double-bellied superior rectus muscle. Surg Radiol Anat 41, 713–715 (2019). https://doi.org/10.1007/s00276-019-02211-0

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  • DOI: https://doi.org/10.1007/s00276-019-02211-0

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