1
.
| Medial cluneal nerves |
2
.
| Coccyx (covered by periosteum and ligaments) |
3
.
| Anococcygeal ligament |
4
.
| Gluteus maximus muscle (portion arising from sacrotuberous ligament) |
5
.
| Upper pointer: Anus Lower pointer: External anal sphincter muscle |
6
.
| Inferior cluneal nerves |
7
.
| Posterior perineal branches femoral cutaneous nerve |
8
.
| Fascia lata |
9
.
| Upper pointer: Superficial perineal fascia (Colles' fascia) Lower pointer: Scrotum |
10
.
| Ischiorectal fossa (pointer indicates posterior recess of fossa) |
11
.
| Left pointer: Inferior rectal nerves Right pointer: Inferior rectal artery |
12
.
| Upper pointer: Lunate fascia Lower pointer: Posterior border of urogenital triangle |
13
.
| Gluteus maximus muscle |
14
.
| Posterior scrotal nerves |
15
.
| Semimembranosus muscle |
16
.
| Semitendinosus muscle |
17
.
| adductor magnus muscle |
18
.
| Gracilis muscle |