The Torah simply says God created Adam "male and female He created them." Targum Pseudo-Jonathan on (Genesis 1:27) hands us an anatomy textbook.
The Lord created Adam "with two hundred and forty and eight members, with three hundred and sixty and five nerves, and overlaid them with skin, and filled it with flesh and blood." Those numbers are not arbitrary. The Talmud (Makkot 23b) teaches that the 613 commandments of the Torah split into 248 positive commands — one for each limb of the body — and 365 prohibitions, one for each day of the solar year and, in Pseudo-Jonathan's reading, one for each nerve.
The Targumist is writing the Torah into the body. Before Sinai, before any commandment is given, the human being is physically constructed to receive the Torah. Each limb will one day perform a mitzvah. Each nerve will one day refrain from a transgression. Adam is not a container that will later be filled with commandments. He is the commandments, in flesh.