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.
There are a number of indicators of biological sex, including sex chromosomes, gonads, internal reproductive organs, and external genitalia. Gender refers to the attitudes, feelings, and behaviors that a given culture associates with a personâs biological sex.Behavior that is compatible with cultural expectations is referred to as gender-normative; behaviors that are viewed as incompatible with these expectations constitute gender non-conformity.here are a number of indicators of biological sex, including sex chromosomes, gonads, internal reproductive organs, and external genitalia. Gender refers to the attitudes, feelings, and behaviors that a given culture associates with a personâs biological sex.