Which muscle is a major component of the levator ani?

Which muscle is a major component of the levator ani?

• A. Pubococcygeus
• B. Coccygeus
• C. Piriformis
• D. Obturator internus

Answer: (A)

The levator ani forms the main part of the pelvic diaphragm and is made up of several muscles, including puborectalis, pubococcygeus, and iliococcygeus. Among the options, pubococcygeus is the muscle that belongs to this group and contributes most of the bulk to the levator ani. It travels from the pubic bone to the coccyx and to the midline structures, forming a supportive sling around the anorectal junction that helps elevate the pelvic floor and maintain continence during increases in intra-abdominal pressure. The other muscles listed are not part of the levator ani. Coccygeus is a separate posterior pelvic floor muscle, while piriformis and obturator internus are lateral pelvic wall/hip muscles and do not comprise the pelvic diaphragm.

The levator ani forms the main part of the pelvic diaphragm and is made up of several muscles, including puborectalis, pubococcygeus, and iliococcygeus. Among the options, pubococcygeus is the muscle that belongs to this group and contributes most of the bulk to the levator ani. It travels from the pubic bone to the coccyx and to the midline structures, forming a supportive sling around the anorectal junction that helps elevate the pelvic floor and maintain continence during increases in intra-abdominal pressure.

The other muscles listed are not part of the levator ani. Coccygeus is a separate posterior pelvic floor muscle, while piriformis and obturator internus are lateral pelvic wall/hip muscles and do not comprise the pelvic diaphragm.