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Novel Muscle in Infraspinous Fossa
Emma R Lesser1, Chung Yoh Kim1, Keishiro Kikuchi1,2
1Department of Neurosurgery, Center for Clinical Neurosciences, Tulane University School of Medicine, New Orleans, USA.
Cureus
|April 15, 2024
Summary
A novel accessory muscle was found in the infraspinous fossa, alongside the standard infraspinatus muscle (IS). This finding adds to the understanding of rotator cuff anatomical variations and glenohumeral joint stability.
Area of Science:
- Anatomy
- Musculoskeletal System
- Human Variation
Background:
- The infraspinatus muscle (IS) is a key component of the rotator cuff, primarily stabilizing the glenohumeral (GH) joint.
- While rotator cuff muscle variations are known, detailed reports on infraspinatus muscle variants are scarce.
Observation:
- A case study identified an accessory muscle originating within the infraspinous fossa.
- The accessory muscle was observed in proximity to a normally located infraspinatus muscle.
Findings:
- Detailed anatomical features and innervation patterns of the accessory muscle were documented.
- This accessory muscle represents a previously undescribed anatomical variant.
Implications:
- Contributes to the understanding of anatomical diversity within the rotator cuff.
- May offer insights into potential sources of shoulder pain or altered biomechanics.
- Highlights the importance of recognizing anatomical variations in clinical practice and surgical planning.
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