A rare bilateral variation on the dorsum of the hand: extensor digitorum brevis manus and extensor medii proprius

Lee, Dong Hoon; Lee, Jae Hee; Woo, Ran-Sook; Song, Dae-Yong; Baik, Tai-Kyoung; Yoo, H.I.

doi:10.5115/acb.2019.52.1.97

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…The various types of The hands are important part of upper limb and it plays a pivotal role in skilled movements for manual dexterity in professional labour and recreational activities. The arrangement of muscles in the extensors of hand is varied and its variations are commonly identified during surgical procedures and cadaveric dissections anomalous muscles reported are extensor indicis proprius (EIP), the extensor digitorum brevis manus (EDBM), the extensor medii proprius (EMP), the extensor indicis et medii communis, and the extensor indicis brevis manus (EIBM) [1][2][3][4][5]. Also, the dorsum of the hand may show variations in attachments of tendons of the muscles as well as supernumerary muscles in the hand [1,6].…”

Section: Journal Informationmentioning

confidence: 99%

A Cadaveric Study on the Anomalous Extensors of the Hand

Esakkiammal¹,

Rajasundaram²,

Sharma³

et al. 2022

IJAR

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Background: The hands play a pivotal role in skilled movements. Anomalous muscles of the extensors of the hand are seen usually in anatomical dissections and during surgeries. Variations of the muscles in the dorsum of hand may be asymptomatic or may cause dorsal wrist pain, particularly if a muscle belly encroaches on and obstruct the wrist's small extensor compartments deep to extensor retinaculum. Methods: A total of 54 upper limb specimens were used for the current study from the Anatomy Department of an undergraduate & postgraduate teaching Medical College in India. Incidence of additional muscle belly and its tendon in the posterior compartment of the forearm and dorsum of the hand were noted and photographed. Results: The anomalous muscle bellies and tendons in extensor compartment of forearm and dorsum of hand were observed in 10 limbs (18.5%) of 54 limbs. Of which, the extensor medii proprius (EMP) was 9.3%, extensor digitorum brevis manus (EDBM) was 3.7%. The numbers of the tendon of the extensor digitorum (ED) were varied in 3 limbs (5.6%). Conclusion: Knowledge of anatomical data of such variant muscles and additional belly or tendon in the extensor compartment of forearm and dorsum of hand is essential for surgeons to modify treatment plan, so as to avoid reporting error and of surgical procedures while operating on hand. KEY WORDS: Hand extensors, Anomalous muscles, Extensor mediiproprius, Extensor digitorum brevis manus, Extensor digitorum.

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Section: Journal Informationmentioning

confidence: 99%

A Cadaveric Study on the Anomalous Extensors of the Hand

Esakkiammal¹,

Rajasundaram²,

Sharma³

et al. 2022

IJAR

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“…The EDBM is comparatively common in amphibians, and its evolutionary disappearance from humans is due to its replacement by the tendons of long antebrachial muscles, which could have originated from the old extensor brevis (Bolla et al, 2008). The presence of an EDBM is caused by failure of the deep portion of the precursor extensor muscle in the upper limb to delineate properly (Lee et al, 2019).…”

Section: Upper Limbmentioning

confidence: 99%

Atavistic muscles in human anatomy: Evolutionary origins and clinical implications

Wahl

Lee

Olewnik

et al. 2022

Anat Histol Embryol

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The evolution and variation of human anatomy are of great interest to physicians and anatomists. Some of these variations can be categorized as vestigial, accessory or atavistic structures. Vestigial structures are rudimentary structures normally seen in human anatomy that correspond to fully elaborated structures in mammals with more primitive phenotypes. They are present in all members of a population. Some of the more common vestigial structures in humans include the wisdom teeth, the appendix and the coccyx.

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“…Additionally, information on the anatomical variation in the human hand is important for researchers looking to describe the functional significance and evolution of the human hand [3]. Types of variations previously described in the literature include the extensor digitorum brevis manus (EDBM) [4], the extensor medii proprius (EMP), the extensor indicis et medii communis (EIMC), the extensor pollicis et indicis accessorius (EPI) [2], and variations in the number of extensor digitorum communis (EDC) tendons, slips and their insertion sites [5]. The EDBM is defined as originating from the distal end of the radius and radiocarpal ligaments and inserting into the metacarpophalangeal joint of the third digit [4].…”

Section: Introductionmentioning

confidence: 99%

“…Types of variations previously described in the literature include the extensor digitorum brevis manus (EDBM) [ 4 ], the extensor medii proprius (EMP), the extensor indicis et medii communis (EIMC), the extensor pollicis et indicis accessorius (EPI) [ 2 ], and variations in the number of extensor digitorum communis (EDC) tendons, slips and their insertion sites [ 5 ]. The EDBM is defined as originating from the distal end of the radius and radiocarpal ligaments and inserting into the metacarpophalangeal joint of the third digit [ 4 ]. The EIMC is defined as originating from the distal third of the ulna with two tendons inserting into the index and long fingers [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…From radial to ulnar side the order of compartments and their contents is as follows: first compartment contains the abductor pollicis longus and extensor pollicis brevis; second compartment contains the extensor carpi radialis longus and brevis; third compartment contains the extensor pollicis longus; fourth compartment contains the EDC and extensor indicis proprius (EIP); fifth compartment contains the extensor digiti minimi; and sixth compartment contains the extensor carpi ulnaris [ 8 ]. The fourth dorsal compartment of the forearm, which typically contains the EIP and EDC tendons, can be the site of supernumerary muscles including the EMP [ 4 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

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Extensor Medii Proprius: A Cadaveric Case Report

Baker,

Swartz,

Garcia

et al. 2023

Cureus

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During routine dissection of 11 cadavers that originated with the Body Donor Program at Philadelphia College of Osteopathic Medicine (PCOM) Georgia, a 69-year-old African American male with bilateral extensor anomalies in the dorsal forearm compartment was encountered. The distinct muscle belly, identified as the extensor medii proprius (EMP), originated from the distal ulna and was inserted near the dorsal aponeurosis of the third digit. Manual traction of the right EMP tendon resulted in the extension of the third digit, suggesting the functional significance of the anomalous muscle. This case study analyzes the EMP found during dissection, as well as the anomalous muscle's prevalence, embryologic origin, and clinical relevance. The presence of the EMP muscle and tendon can be considered when assessing pain in the dorsum of the hand and when preparing for surgical repair or tendon transfer.

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A rare bilateral variation on the dorsum of the hand: extensor digitorum brevis manus and extensor medii proprius

Cited by 4 publications

References 8 publications

A Cadaveric Study on the Anomalous Extensors of the Hand

A Cadaveric Study on the Anomalous Extensors of the Hand

Atavistic muscles in human anatomy: Evolutionary origins and clinical implications

Extensor Medii Proprius: A Cadaveric Case Report

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