| 1
.
| Coccyx (terminal piece) |
| 2
.
| Gluteus maximus muscle (fibers cut off at origin from sacrotuberous ligament) |
| 3
.
| Coccygeus muscle |
| 4
.
| Piriform muscle |
| 5
.
| Levator ani muscle |
| 6
.
| Sacrotuberous ligament |
| 7
.
| Upper pointer: Infrapiriform foramen (part of greater sciatic foramen through which inferior gluteal vessels and nerves emerge) Lower pointer: Posterior femoral cutaneous nerve |
| 8
.
| Inferior rectal nerves |
| 9
.
| Inferior rectal artery |
| 10
.
| Ischial tuberosity |
| 11
.
| Lunate fascia (covering pudendal canal and obscuring obturator fascia) |
| 12
.
| Obturator externus muscle |
| 13
.
| Ramus of ischium |
| 14
.
| Ischiocavernosus muscle (visible through deep perineal fascia) |
| 15
.
| Posterior scrotal nerve (exposed by removal of membranous layer of superficial perineal fascia to the left of midline) |
| 16
.
| Perineal branch of inferior rectal nerve |
| 17
.
| Bulb of penis |
| 18
.
| Anococcygeal ligament |
| 19
.
| Middle cluneal nerve |
| 20
.
| Inferior fascia of pelvic diaphragm |
| 21
.
| Lunate fascia covering pudendal canal |
| 22
.
| Upper pointer: Anus Lower pointer: External anal sphincter muscle |
| 23
.
| Posterior margin of urogenital triangle (membranous layer of superficial perineal fascia intact to right of midline in this area) |
