Sternalis muscle: Anatomical variations in Thais.

ABSTRACT

Objective: To study and classify the types of the sternalis muscle in Thais, who has lived in Bangkok and the surrounding area, and compare its incidence to that of the other races. Methods: The sternalis muscles were dissected and classified in Thai cadavers. The morphology of each type was shown by photograph. Tables showed numbers and percentage of the muscle in male and female, right and left sides. Results: The study of 126 Thai cadavers, the sternalis muscle was found in 9 cadavers. The incidence was 7.14%. The muscle was divided into 2 types, type A was the bilateral type and type B was the unilateral type. Conclusion: The sternalis muscle was an anatomical variation of the thoracic wall musculature. Its incidence in Thais was 7.14%. The morphology of the muscle was shown and divided into 2 types.