Ligaments and joints of lumbosacral spine and pelvic girdle

Ligaments of coccygeal region, close-up posterior view

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Image #215-2
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Ligaments and joints of lumbosacral spine and pelvic girdle
Ligaments of coccygeal region, close-up posterior view
1 . Dorsal branch coccygeal nerve
2 . Dorsal branch sacral nerve V
3 . Connecting ioop between fifth sacral nerve and coccygeal nerve
4 . Piriform muscle (transected)
5 . Sciatic nerve
6 . Lateral border of sacrum
7 . Inferior gluteal artery
8 . Internal pudendal vein (cut off)
9 . Upper pointer: Pudendal nerve Lower pointer: Internal pudendal artery
10 . Inferior rectal nerve
11 . Ischial spine (covered by fibers of coccygeus muscle)
12 . Coccygeus muscle (overlying sacrospinous ligament)
13 . Levator ani muscle (pointer on iliococcygeus muscle)
14 . Obturator internus muscle
15 . Upper pointer: Inferior rectal artery Lower pointer: Perineal artery
16 . Lunate fascia (reflected to expose perineal vessels and nerves in pudendal canal)
17 . Levator ani muscle (pointer on pubococcygeus muscle)
18 . Anococcygeal nerve
19 . Sacral cornu (horn)
20 . Coccygeal cornu (horn)
21 . Aperture for dorsal ramus of fifth sacral nerve
22 . Dorsal superficial sacrococcygeal ligament
23 . Upper pointer: Deep dorsal sacrococcygeal ligament Lower pointer: Sacrotuberous ligament
24 . Coccyx (terminal segment)
25 . Lunate fascia
26 . Inferior pelvic diaphragmatic fascia
27 . Anococcygeal ligament
28 . External anal sphincter muscle
29 . Anus