The pelvis is a basin-shaped bony structure connecting the spine to the lower limbs, critical for supporting upper body weight, aiding balance, and protecting reproductive and abdominal organs. It consists of the ilium, ischium, pubis, sacrum, and coccyx. It is divided into the true (lesser) and false (greater) pelvis. 

Key Aspects of the Pelvis

• Anatomy: The bony pelvis is formed by the pairing of hip bones (innominate bones) joined anteriorly at the pubic symphysis and posteriorly to the sacrum, notes Radiopaedia. It contains the pelvic cavity, which houses organs like the bladder, rectum, and reproductive organs, notes Cleveland Clinic.
• Functions: The primary functions include transferring upper body weight to the lower limbs, providing attachment points for strong muscles, and protecting pelvic viscera.
• Musculature: The pelvic floor, a complex layer of muscles and ligaments, supports internal organs, aids in stability, and helps maintain urinary and fecal continence, says this NIH resource.
• Gender Differences: The female pelvis is typically wider and shallower to accommodate childbirth.
• Clinical Significance: The pelvis is vulnerable to fractures from falls, particularly in older adults. Conditions such as Pelvic Girdle Pain (PGP) can occur, especially during pregnancy.