Which muscle provides the chief support to the uterus?

• A. Levator ani
• B. Coccygeus
• C. Pubococcygeus
• D. Rectus abdominis

Answer: (C)

The main idea is that pelvic floor muscles form the support framework for pelvic organs, including the uterus. Within the pelvic diaphragm, the muscle bundle that provides the chief muscular support to the uterus is the pubococcygeus. It runs from the pubic bone to the coccyx and makes up the central, most active part of the levator ani. When it contracts, it elevates and tightens the pelvic floor, helping to keep the uterus in its proper position and resist downward pressure from abdominal activities like coughing or lifting. This direct, sturdy support to the pelvic viscera is why pubococcygeus is considered the primary muscular support for the uterus.

The other muscles either contribute to pelvic floor support as part of the whole levator ani group or have a smaller role (coccygeus) or are not involved in pelvic floor support (rectus abdominis).