A newly reported muscle: an accessory infraspinatus or a deep layer of the latissimus dorsi?

Koptas, Krzysztof; Zielinska, Nicol; Tubbs, R. Shane; Olewnik, Łukasz; Łabętowicz, Piotr

doi:10.1007/s00276-022-02917-8

Cited by 7 publications

(8 citation statements)

References 16 publications

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“…The usual reason for this pathology is compression of the suprascapular nerve in the spinoglenoid notch. Infraspinatus muscle atrophy commonly occurs in sports with overhead throwing motions, such as tennis [ 8 ] and volleyball [ 9 ]. This pathology is not painful, but it limits the athlete’s achievements [ 8 , 9 ].…”

Section: Discussionmentioning

confidence: 99%

“…Infraspinatus muscle atrophy commonly occurs in sports with overhead throwing motions, such as tennis [ 8 ] and volleyball [ 9 ]. This pathology is not painful, but it limits the athlete’s achievements [ 8 , 9 ]. Such atrophy can be treated with exercises that strengthen the external rotators of the glenohumeral joint.…”

Section: Discussionmentioning

confidence: 99%

“…If the rehabilitation is not effective, this pathology can be treated surgically. Neurolysis of the compressed nerve succeeded by temporary immobilization and rehabilitation brings satisfactory results [ 9 ].…”

Section: Discussionmentioning

confidence: 99%

“…A double-headed infraspinatus minor muscle can provide additional strength and precision for movements in the shoulder girdle. It can be crucial for athletes practicing sports, such as softball, tennis or volleyball [ 8 , 9 , 16 ]. Fusion between the infraspinatus and teres minor muscles with three additional muscle slips can support both muscles.…”

Section: Discussionmentioning

confidence: 99%

“…Atrophy of the infraspinatus muscle is sometimes a reason why an athlete’s performance is limited [ 8 , 9 ]. At the root of this pathology, compression of the suprascapular nerve in the spinoglenoid notch is common.…”

Section: Introductionmentioning

confidence: 99%

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An unreported infraspinatus muscle variation—two-headed infraspinatus minor muscle and three-headed fusion with the teres minor muscle

et al. 2022

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The infraspinatus muscle is situated under the scapular spine in the infraspinous fossa and inserts into the greater tuberosity of the humerus. It is a component of a crucial shoulder muscle group, the rotator cuff. There are a few interesting additional muscles in the infraspinal region. In the literature they are called the infraspinatus superficialis, infraspinatus minor and infraspinatus accessory muscles. The infraspinatus minor muscle is described as a superficial muscle bundle running under the scapular spine. During routine anatomical dissection, an unreported variation of the infraspinatus minor muscle was found. It derived from the inferior surface of the scapular spine and the infraspinous fossa. It had two heads. The superior head inserted on the greater tuberosity of the humerus. The inferior head inserted on the tendinous part of the infraspinatus muscle. There was also an unusual fusion of the infraspinatus muscle with the teres minor muscle. In this paper we will discuss the anatomical and physiological relationships of this morphological variation.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An unreported infraspinatus muscle variation—two-headed infraspinatus minor muscle and three-headed fusion with the teres minor muscle

et al. 2022

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Cross-sectional and biomechanical investigation of concurrent infraspinatus and teres minor muscle variations: A case report

Snow,

Potthoff,

Adwer

2024

Translational Research in Anatomy

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Accessory infraspinatus muscle in a male cadaver: a case report

Cobb¹,

Palmer²,

Cooke³

2023

Preprint

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Purpose The infraspinatus muscle is a component of the rotator cuff that has relatively few known variants. Understanding variation in this structure is critical for clinicians and may have implications for understanding human development. Methods One 83-year-old male cadaver was dissected as part of the graduate anatomy education curriculum at Johns Hopkins University School of Medicine in fall 2022. Dissections were guided using Grant’s Dissector, 17th edition as a reference. Results An accessory infraspinatus muscle as well as other muscular and neurological variations were discovered in the cadaver. The variant muscle is thin and flat with parallel fibers originating on the medial dorsal surface of the scapula, running under the scapular spine, and inserting on the greater tubercle of the humerus. The accessory infraspinatus muscle is separated from the infraspinatus muscle and deltoid muscle by fascial planes, and its muscle body extends past the tendinous portion of the underlying infraspinatus muscle; we suggest these as additional criteria for the identification of the accessory infraspinatus. Conclusion This is the second reported occurrence of an accessory infraspinatus muscle and the first known occurrence in a male. The co-occurrence of this rare variant with other variations in the limbs, back, and head suggests that variation in development may be affecting the entire body, ultimately being responsible for the presence of an accessory infraspinatus in this cadaver.

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A newly reported muscle: an accessory infraspinatus or a deep layer of the latissimus dorsi?

Cited by 7 publications

References 16 publications

An unreported infraspinatus muscle variation—two-headed infraspinatus minor muscle and three-headed fusion with the teres minor muscle

An unreported infraspinatus muscle variation—two-headed infraspinatus minor muscle and three-headed fusion with the teres minor muscle

Cross-sectional and biomechanical investigation of concurrent infraspinatus and teres minor muscle variations: A case report

Accessory infraspinatus muscle in a male cadaver: a case report

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