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.
Cultural Implications. Culture shapes the ideas of what behaviors are acceptable for men and women as well as what behaviors are appropriate between men and women. Gender identity and culture share a strong connection as they affect daily life not only in the home and family but also in the workplace and community.