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Classification of unusual insertion of the pectoralis minor muscle

Authors
 Kang-Woo Lee  ;  You-Jin Choi  ;  Hyung-Jin Lee  ;  Young-Chun Gil  ;  Hee-Jin Kim  ;  Tanvaa Tansatit  ;  Kyung-Seok Hu 
Citation
 Surgical and Radiologic Anatomy, Vol.40(12) : 1357-1361, 2018 
Journal Title
 Surgical and Radiologic Anatomy 
ISSN
 0930-1038 
Issue Date
2018
MeSH
Aged ; Anatomic Variation ; Asian Continental Ancestry Group ; Cadaver ; Female ; Humans ; Male ; Pectoralis Muscles/anatomy & histology* ; Ribs/anatomy & histology*
Keywords
Clavicle ; Coracohumeral ligament ; Coracoid process ; Glenohumeral joint capsule ; Pectoralis minor muscle ; Variation
Abstract
PURPOSE: The pectoralis minor muscle (PMi) generally originates from the third, fourth, and fifth ribs and inserts on the medial and superior margins of the anterior portion of the coracoid process. Variations in the shape and attachment point of the PMi could cause discomfort in the shoulders. The aim of this study was to observe the types of morphological insertion patterns and attachment sites of the PMi. METHODS: Seventy-four sides of fresh, embalmed Korean (42 sides; mean age 78 years) and Thai (32 sides; mean age 78 years) cadavers were dissected to analyze the morphological insertion types and attachment sites of the PMi. RESULTS: Unusual insertion patterns were evident in about 23% of the samples. When the portion of the PMi tendon ran over the coracoid process, the most common attachment site was the glenohumeral joint capsule. We also confirmed the attachment of the PMi to the clavicle. Costal attachments of the PMi that extend from the second rib to the fourth rib were observed frequently as well. CONCLUSIONS: Unusual insertion patterns of the PMi are common. Some authors consider that tendon attachment to the joint capsule can cause shoulder pain. In addition, the PMi tendon could be utilized in acromioclavicular joint reconstruction. Surgeons need to be aware of the possibility of a PMi variant being found during surgery even when this is not visible in magnetic resonance or ultrasound imaging.
Full Text
https://link.springer.com/article/10.1007%2Fs00276-018-2107-0
DOI
10.1007/s00276-018-2107-0
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Oral Biology (구강생물학교실) > 1. Journal Papers
Yonsei Authors
Kim, Hee Jin(김희진) ORCID logo https://orcid.org/0000-0002-1139-6261
Lee, Kang Woo(이강우)
Lee, Hyung Jin(이형진) ORCID logo https://orcid.org/0000-0002-3082-935X
Choi, You Jin(최유진) ORCID logo https://orcid.org/0000-0003-3701-2200
Hu, Kyung Seok(허경석) ORCID logo https://orcid.org/0000-0002-9048-3805
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URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/167273
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