Deep Perineal Fascia (Gallaudet's Fascia)

The deep perineal fascia, also known as Gallaudet’s fascia, is a strong connective tissue layer that invests the superficial perineal muscles. It lies deep to Colles’ fascia and superficial to the perineal membrane, forming part of the boundary of the superficial perineal pouch. It is continuous with deep fascia of the external oblique and fascia of the penis or clitoris. This fascia plays an important role in anchoring and directing muscle action in the perineum.

Structure

Gallaudet’s fascia is composed of dense, fibrous connective tissue. It provides a tough investing layer around the superficial perineal muscles, ensuring they remain in anatomical position during contraction. It helps transmit muscular forces to underlying erectile structures.

Attachments and Continuities

• Lateral: Ischiopubic rami
• Anterior: Continuous with deep fascia of external oblique and Buck’s fascia (penis) or clitoral fascia
• Posterior: Merges with posterior edge of the perineal membrane

Muscles Invested

• Ischiocavernosus
• Bulbospongiosus
• Superficial transverse perineal muscle

Location

The deep perineal fascia lies within the urogenital triangle, forming the deep boundary of the superficial perineal pouch. It envelops the superficial perineal muscles and lies directly superficial to the perineal membrane.

Function

• Muscle investment: Encloses and supports the superficial perineal muscles
• Force transmission: Helps direct contractile forces of muscles onto erectile tissues
• Structural separation: Helps define the boundaries of the superficial perineal pouch

Clinical Significance

• Surgical relevance: Important to identify during perineal surgeries to avoid misidentification of fascial layers
• Pelvic floor integrity: Damage or disruption may reduce support for erectile or perineal function