A Unilateral Variation in Triceps Brachii Muscle Demonstrating a Fourth Head
Introduction Triceps brachii muscle is the only muscle of posterior compartment of arm, consisting of three heads—long, lateral, and medial. Radial nerve and profunda brachii artery run in the radial groove that separate lateral and medial head. Evolutionarily, triceps has many subheads which either...
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Thieme Medical and Scientific Publishers Pvt. Ltd.
2021-10-01
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| Series: | Annals of the National Academy of Medical Sciences (India) |
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| Online Access: | http://www.thieme-connect.de/DOI/DOI?10.1055/s-0041-1739033 |
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| author | Shveta Swami Virendra Budhiraja Deepak Sharma Rimpi Gupta Swati Bansal |
| author_facet | Shveta Swami Virendra Budhiraja Deepak Sharma Rimpi Gupta Swati Bansal |
| author_sort | Shveta Swami |
| collection | DOAJ |
| description | Introduction Triceps brachii muscle is the only muscle of posterior compartment of arm, consisting of three heads—long, lateral, and medial. Radial nerve and profunda brachii artery run in the radial groove that separate lateral and medial head. Evolutionarily, triceps has many subheads which either fused or disappeared. Therefore, the knowledge of muscle is essential anthropologically and clinically, and this study aims to study the anatomical variations of triceps brachii muscle.
Case Report In the present case, during routine dissections of undergraduate MBBS students, a fourth head of origin of triceps brachii muscle was seen in a male cadaver in the right arm. The variation was seen only unilaterally in cadaver. The origin was tendinous arising from the posteromedial aspect of upper part of the shaft of the humerus close to the surgical neck above the radial groove. This tendon was arching over the neurovascular bundle containing radial nerve and profunda brachii artery.
Discussion and Conclusion The variations of triceps brachii muscles are mentioned in literature but are uncommon and if tendinous fourth head is present over the neurovascular bundles, it may lead to compression syndrome. Hence, these variations are of great importance to the radiologists, surgeons, and orthopaedicians while dealing with posterior compartment of arm. |
| first_indexed | 2024-12-13T21:33:37Z |
| format | Article |
| id | doaj.art-bbe90684080b4ababa1e74fb57dafc8c |
| institution | Directory Open Access Journal |
| issn | 0379-038X 2454-5635 |
| language | English |
| last_indexed | 2024-12-13T21:33:37Z |
| publishDate | 2021-10-01 |
| publisher | Thieme Medical and Scientific Publishers Pvt. Ltd. |
| record_format | Article |
| series | Annals of the National Academy of Medical Sciences (India) |
| spelling | doaj.art-bbe90684080b4ababa1e74fb57dafc8c2022-12-21T23:30:44ZengThieme Medical and Scientific Publishers Pvt. Ltd.Annals of the National Academy of Medical Sciences (India)0379-038X2454-56352021-10-01570424424610.1055/s-0041-1739033A Unilateral Variation in Triceps Brachii Muscle Demonstrating a Fourth HeadShveta Swami0Virendra Budhiraja1Deepak Sharma2Rimpi Gupta3Swati Bansal4Department of Anatomy, Kalpana Chawla Government Medical College, Karnal, Haryana, IndiaDepartment of Anatomy, Kalpana Chawla Government Medical College, Karnal, Haryana, IndiaDepartment of Pediatric and Preventive Dentistry, R. P. Welltar Hospital, Karnal, Haryana, IndiaDepartment of Anatomy, Kalpana Chawla Government Medical College, Karnal, Haryana, IndiaDepartment of Anatomy, Kalpana Chawla Government Medical College, Karnal, Haryana, IndiaIntroduction Triceps brachii muscle is the only muscle of posterior compartment of arm, consisting of three heads—long, lateral, and medial. Radial nerve and profunda brachii artery run in the radial groove that separate lateral and medial head. Evolutionarily, triceps has many subheads which either fused or disappeared. Therefore, the knowledge of muscle is essential anthropologically and clinically, and this study aims to study the anatomical variations of triceps brachii muscle. Case Report In the present case, during routine dissections of undergraduate MBBS students, a fourth head of origin of triceps brachii muscle was seen in a male cadaver in the right arm. The variation was seen only unilaterally in cadaver. The origin was tendinous arising from the posteromedial aspect of upper part of the shaft of the humerus close to the surgical neck above the radial groove. This tendon was arching over the neurovascular bundle containing radial nerve and profunda brachii artery. Discussion and Conclusion The variations of triceps brachii muscles are mentioned in literature but are uncommon and if tendinous fourth head is present over the neurovascular bundles, it may lead to compression syndrome. Hence, these variations are of great importance to the radiologists, surgeons, and orthopaedicians while dealing with posterior compartment of arm.http://www.thieme-connect.de/DOI/DOI?10.1055/s-0041-1739033triceps brachiivariationsfourth headneurovascular bundlecompression syndrome |
| spellingShingle | Shveta Swami Virendra Budhiraja Deepak Sharma Rimpi Gupta Swati Bansal A Unilateral Variation in Triceps Brachii Muscle Demonstrating a Fourth Head Annals of the National Academy of Medical Sciences (India) triceps brachii variations fourth head neurovascular bundle compression syndrome |
| title | A Unilateral Variation in Triceps Brachii Muscle Demonstrating a Fourth Head |
| title_full | A Unilateral Variation in Triceps Brachii Muscle Demonstrating a Fourth Head |
| title_fullStr | A Unilateral Variation in Triceps Brachii Muscle Demonstrating a Fourth Head |
| title_full_unstemmed | A Unilateral Variation in Triceps Brachii Muscle Demonstrating a Fourth Head |
| title_short | A Unilateral Variation in Triceps Brachii Muscle Demonstrating a Fourth Head |
| title_sort | unilateral variation in triceps brachii muscle demonstrating a fourth head |
| topic | triceps brachii variations fourth head neurovascular bundle compression syndrome |
| url | http://www.thieme-connect.de/DOI/DOI?10.1055/s-0041-1739033 |
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