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.
exists and is an alternate of . Gender identity is how you define your own gender, ie, a man or a woman. Gender roles are the set of societal norms that each gender generally abide by. Gender identity is how you define your own gender, ie, a man or a woman. Gender roles are the set of societal norms that each gender generally abide by.