The deep transverse perineal muscle forms the muscular base of the urogenital diaphragm in the deep perineal pouch. It is closely associated with the external urethral sphincter and shares its innervation.
| Origin | Ischial rami — medial surface, deep perineal pouch |
|---|---|
| Insertion | Central perineal tendon (perineal body) — anterior portion; Surrounds the urethra — external urethral sphincter component |
| Nerve Supply | Pudendal nerve — perineal branch (S2-S4) |
| Blood Supply | Internal pudendal artery |
| Actions | Compresses the urethra — contributes to urinary continence; Stabilises the perineal body during straining |
|---|
In radical prostatectomy, the deep transverse perineal muscles are encountered during the urethral dissection — their preservation contributes to post-operative continence by maintaining the pelvic floor support below the anastomosis. In female stress incontinence surgery (mid-urethral sling), the sling passes through the deep transverse perineal musculature.
Not palpable externally. Assessed during perineal surgery.
Preservation of the deep transverse perineal muscle during robotic radical prostatectomy contributing to improved post-operative urinary continence outcomes.
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