Double-bellied superior rectus muscle

@article{Nayak2019DoublebelliedSR,
  title={Double-bellied superior rectus muscle},
  author={Satheesha B. Nayak and Surekha D Shetty and Naveen Kumar and Ashwini P Aithal},
  journal={Surgical and Radiologic Anatomy},
  year={2019},
  volume={41},
  pages={713-715}
}
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… 
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A 13-year-old male with Down syndrome, pseudophakic secondary to congenital cataract presented with esotropia, and a unilateral two-bellied right medial rectus was identified and recessed successfully with complete resolution of the deviation.
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This issue of ERMs innervation was presented in detail, considering the research that has recently been carried out on human material using advanced anatomical techniques such as Sihler's technique of the nerves staining.

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