The platysma is a superficial muscle that overlaps the sternocleidomastoid. It is a broad sheet arising from the fascia covering the upper parts of the pectoralis major and deltoid; its fibers cross the clavicle, and proceed obliquely upward and medially along the side of the neck.
For example genetic differences, females inherit X chromosomes from their father giving them a genetic make-up of XX, while males inherit a Y chromosome from their father, thus giving them a genetic make-up of XY.
Gender is also determined by what an individual feels and does. The sociology of gender examines how society influences our understandings and perception of differences between masculinity (what society deems appropriate behaviour for a âmanâ) and femininity (what society deems appropriate behaviour for a âwomanâ).