Abstract
Introduction: Subclavius posticus muscle (SPM) is a rare anomalous muscle that traverses from costal cartilage of first rib posterolaterally to superior border of scapula. The aim of the study was to study the prevalence of SPM in adult cadavers. Material and Methods: Fifty upper limbs from embalmed cadavers allotted for routine dissection practical for first MBBS students were used for the study. There were twenty male and five female cadavers, with ages ranging from 60 to 80 years, specimens of both sides were used. Results: The SPM was found in seven cases out of fifty cases, two on left, and five on the right side of pectoral region. Discussion and Conclusion: The presence of variant SPM could be a predisposing causative factor of thoracic outlet syndrome.
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