Sternalis muscle, a rare anatomical variation with clinical implications

The sternalis muscle is a rare variant of the anterior chest wall musculature. Although its frequency in general population worldwide has been reported from 2% to 8%, its prevalence depends on regions and populations. The aim of this paper is to describe one of the first cases of sternalis muscle found in Central Europe. An anterior chest wall of 64-year-old white male was dissected during a regular anatomy class at Department of Human Anatomy. A right unilateral sternalis muscle was revealed and described. The unilateral sternalis muscle laid between the pectoral and the superficial thoracic fascia. The muscle was long and wide. In addition, it had a massive tendon. According to the Snosek et al. Classification, it was a “simple unilateral” type. This report presents another case of the sternalis muscle among humans. Although the sternalis muscle serves a minor role in body movement, its occurrence gives several clinical implications. The awareness of variability in the thoracic region is important during diagnostic and treatment processes or in surgical operation planning.