Final answer:
The perineum is a diamond-shaped space between various bones and muscles in the lower pelvic region. It contains muscles and nerves involved in urination, ejaculation, and vaginal contraction. The perineal body, perineal muscles, and pudendal nerve (S2-S4) are important parts of the perineum.
Step-by-step explanation:
The perineum is the diamond-shaped space between the pubic symphysis (anteriorly), the coccyx (posteriorly), and the ischial tuberosities (laterally), lying just inferior to the pelvic diaphragm (levator ani and coccygeus). It is divided into superficial and deep layers and contains various muscles that play a role in urination, ejaculation, and vaginal contraction. The perineal body, perineal muscles, and the pudendal nerve (S2-S4) are important components of the perineum that help maintain the position of pelvic organs and support their functions.