S2S3S4Obturator internus muscleInferior rectal nerveDorsal nerve of penisSacrospinous ligamentCoccygeus muscleLevator animusclePerineal nervePosterior scrotal nervePudendal nervePudendal canal infascia of obturator internusMotor branches to skeletal muscle in urogenital triangleA
Dorsal nerve of clitorisPosterior labial nerveMotor branchesInferior rectal nervePudendal nervePerineal nerveB
Fig. 5.77 Arteries in the perineum.
Internal iliac arteryInternal pudendal arteryInferior rectal arteryInternal pudendal arteryin fascia of obturator internusDorsal artery of penis(dorsal artery of clitoris in women)Perineal arteryPosterior scrotal artery(posterior labial artery in women)Artery of bulb of penis (artery of vestibular bulb in women)Artery to bulbUrethral arteryDeep artery of penis(deep artery of clitoris in women)
Fig. 5.78 Perineal veins.
Internal pudendal veinInferior rectal veinProstatic plexus of veins(vesical plexus in women)Posterior scrotal vein (or posterior labial vein in women)Deep dorsal vein (or deep dorsal vein of clitoris in women)
Fig. 5.79 Lymphatic drainage of the perineum.
Thoracic ductLymph from testisLILateral aortic(lumbar) nodesExternal iliac nodesSuperficial inguinal nodesLymph fromsuperficial tissues ofpenis and scrotum(clitoris and labia majorain women)Deep inguinal nodesInguinal ligamentTestisLymph from glans penis(glans clitoris, labia minora,and lower part of vaginain women)Pre-aortic nodes
Fig. 5.80 Lateral view of the pelvic area with the position of the skeletal features indicated. The orientation of the pelvic inlet, urogenital triangle, and anal triangle is also shown. A. In a woman. B. In a man.
Plane of pelvic inletPlane of urogenital trianglePlane of anal triangleTuberculum of iliac crestHigh point of iliac crestPosterior superior iliac spineAnterior superior iliac spinePubic tubercleAB
Fig. 5.81 Anterior view of the pelvic area. A. In a woman showing the position of the pubic symphysis. B. In a man showing the position of the pubic tubercle, pubic symphysis, and anterior superior iliac spine.
Fig. 5.82 Inferior view of the perineum in the lithotomy position. Boundaries, subdivisions, and palpable landmarks are indicated. A. In a man. B. In a woman.
Fig. 5.83 Anal triangle with the anal aperture and position of the ischio-anal fossae indicated. A. In a man. B. In a woman.
Anal triangleBIschial tuberosityIschial tuberosityPosition of perineal bodyPosition of ischio-anal fossaPosition of ischio-anal fossaCoccyxAnal apertureAnal triangleAIschial tuberosityPosition of perineal bodyPosition of ischio-anal fossaPosition of ischio-anal fossaCoccyxLabium minusAnal aperture