- May 2, 2026The levator ani is divided into three functional components: puborectalis (the most medial sling-like portion around the anorectum providing continence),…
- May 2, 2026The internal anal sphincter is a 2-3 cm long thickening of the circular smooth muscle layer of the rectum and…
- May 2, 2026The internal urethral sphincter is not an anatomically discrete muscle but rather a functional thickening of the circular smooth muscle…
- May 2, 2026The iliococcygeus is the posterior and thinner portion of the levator ani muscle group, arising from the tendinous arch of…
- May 2, 2026The pubococcygeus is the central and most important component of the levator ani, running from the pubic bone posteriorly to…
- May 2, 2026The sphincter urethrovaginalis is a female-specific striated muscle forming the most distal component of the external urethral sphincter complex. It…
- May 2, 2026The compressor urethrae is a female-specific striated muscle arising from the ischiopubic rami and crossing anteriorly to compress the distal…
- May 2, 2026The ischiourethralis is considered the male counterpart of the female compressor urethrae, originating from the ischial rami and inserting on…
- May 2, 2026The corrugator cutis ani is a layer of smooth muscle fibres in the perianal subcutaneous fat that radiates from the…
- May 2, 2026The superficial transverse perineal muscle is a thin, paired striated muscle running transversely across the anterior perineum from the ischial…