Colles fascia (superficial perineal fascia) is the deep layer of the superficial perineal fascia, continuous with Scarpa fascia of the anterior abdominal wall and the dartos fascia of the scrotum. It is attached posteriorly to the perineal body and the posterior edge of the urogenital diaphragm, forming a closed perineal pouch anteriorly that directs urethral extravasation upward into the scrotum and anterior abdominal wall.
Forms the roof of the superficial perineal pouch; contains extravasated urine in urethral rupture within the perineum, scrotum, and anterior abdominal wall.
Colles fascia is critical in urethral trauma management — rupture of the bulbar urethra causes urinary extravasation to track in the plane deep to Colles fascia, producing the characteristic butterfly bruising of the perineum and scrotal/penile swelling. The fascia prevents posterior spread but allows upward tracking under Scarpa fascia. In hypospadias repair and perineal reconstruction, Colles fascia provides the vascularised dartos fascia used for subcoronal interposition.
Bulbar urethral rupture causing urine extravasation in the superficial perineal pouch beneath Colles fascia producing butterfly perineal bruising and scrotal swelling, managed by suprapubic catheter diversion and delayed urethroplasty.
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