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.
Transgender Transexual Androgyne Transvestite While most people's gender identity matches the anatomical sex with which they were born, some people's does not. A person whose gender identity is different from his or her anatomical sex may (or may not) elect to undergo chemical and/or surgical alteration.