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Double-bellied superior rectus muscle.

Satheesha B Nayak1, Surekha D Shetty2, Naveen Kumar2

  • 1Melaka Manipal Medical College (Manipal Campus), Manipal Academy of Higher Education, Madhav Nagar, Manipal, Karnataka, 576104, India. nayaksathish@gmail.com.

Surgical and Radiologic Anatomy : SRA
|March 9, 2019
PubMed
Summary
This summary is machine-generated.

A rare congenital variation, a double-bellied superior rectus muscle, was found in a 70-year-old male cadaver. This unique anatomical finding, supplied by the oculomotor nerve, is the first documented case of its kind.

Keywords:
ExtraocularEye movementOrbitStrabismusSuperior rectus muscle

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Area of Science:

  • Anatomy
  • Ophthalmology
  • Congenital Variations

Background:

  • Congenital variations of extraocular muscles are uncommon.
  • The superior rectus muscle is crucial for eye movement and eyelid elevation.

Purpose of the Study:

  • To report a rare anatomical variation: a double-bellied superior rectus muscle.
  • To document the origin, insertion, and innervation of this unique muscular anomaly.

Main Methods:

  • Gross anatomical dissection of an adult male cadaver.
  • Detailed observation and documentation of extraocular muscle morphology.

Main Results:

  • A 70-year-old male cadaver presented with a double-bellied superior rectus muscle.
  • The two bellies originated separately from the common tendinous ring and merged before insertion.
  • The duplicated muscle extended laterally beyond the levator palpebrae superioris and received dual innervation from the oculomotor nerve.

Conclusions:

  • This is the first reported case of a double-bellied superior rectus muscle.
  • Such variations may have implications for surgical procedures and understanding ocular motility.
  • Further research is needed to determine the prevalence and clinical significance of this anomaly.