The upper part of the trapezius muscle is the primary target of the shoulder shrug. The trapezius is a triangular muscle that makes up the upper back, running from the back of the neck and down along the spine, lying over the shoulder blades.
In general terms, sex refers to the biological differences between males and females, such as the genitalia and genetic differences. Gender is more difficult to define but can refer to the role of a male or female in society (gender role), or an individual's concept of themselves (gender identity).
Genders can include, but are in no way limited to, man/woman, bigender, agender, non-binary, etc. Gender identity is defined as one's internal sense of being a woman, man, both, or neither, while sexual orientation refers to an individual's enduring physical, romantic, and/or emotional attraction to others.gender (from ' a -', meaning without, and ' gender ') people, also called genderless, genderfree, non-gendered, or ungendered people are those who identify as having no gender or being without any gender identity.