39 - Urogenital diaphragm

Most of the support of the perineum is provided by the pelvic and urogenital diaphragms.


The urogenital diaphragm is external to the pelvic diaphragm and includes the triangular area between the ischial tuberosities and the symphysis. The urogenital diaphragm is made up of the deep transverse perineal muscles, the constrictor of the urethra, and the internal and external fascial coverings (perineal membrane).

37 - Muscles of Perineum/Urogenital region

SUPERFICIAL MUSCLES OF PERINEUM :
1. Superficial Transverse perinei
2. Bulbospongiosus (Bulbocavernosus in older textbooks)
3. Ischiocavernosus

DEEP MUSCLES OF PERINEUM :
1. Deep Transverse Perinei
2. Sphincter urethrae