Dissection of muscles of male perineum and pelvic diaphragm
Muscles of urogenital diaphragm
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Image #174-4
Dissection of muscles of male perineum and pelvic diaphragm
Muscles of urogenital diaphragm
The inferior fascia of the urogenital diaphragm has been removed to reveal the sphincter of the urethra within the deep perineal space. There was no evident deep transverse perineal muscle on either side of this specimen. The bulbourethral gland has been excised. Muscle fibers (4, lower pointer) that are directed posteriorly toward the central point of the perineum were found to be continuous with fibers of the superficial transverse perineal muscle on the left.
- Penis (sectioned)
- Dorsal vein of the penis
- Upper pointer: Dorsal nerve of the penis Lower pointer: Dorsal artery of penis
- Upper pointer: Sphincter muscle of urethra Lower pointer: Muscle fibers within urogenital diaphragm that pass medially towards central tendinous point of perineum
- Penis artery
- Superior fascia of urogenital diaphragm
- Obturator fascia
- Obturator internus muscle
- Ischial tuberosity
- Fibers of levator ani muscle passing to tissue alongside anus
- Levator ani muscle
- Pubic arcuate ligament
- Transverse perineal ligament
- Membranous part of urethra (cut off at lower surface of urogenital diaphragm)
- Obturator membrane
- Posterior border of obturator foramen
- Sacrotuberous ligament
- External anal sphincter muscle
- Anus
- Anococcygeal ligament
- Coccyx