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PELVIC DIAPHRAGM-LEVATOR ANI

Anatomy-Pelvis

PELVIC DIAPHRAGM-LEVATOR ANI

3 COMPONENTS:
1. ILIOCOCCYGEUS - arises from the posterior half of the arcus tendineus & pelvic surface of the ischeal spine. Inserts into the side of coccyx & anococcygeal ligament & raphe.
2. PUBOCOCCYGEUS - arises from anterior half of arcus tendineus & inner surface of pubis. Posterior fibers insert into the side of the coccyx & anococcygeal ligament & raphe. Posterior fibers fuse medially with each other and with deep part of external anal sphincter.
3. PUBORECTALIS - this is the anteromedial part of PUBOCOCCYGEUS which forms a U-shaped sling, holding the anorectal junction angeled forwards.
4 . NS: perineal branches of S3 & S4. BS: inferior gluteal a.
5. A: supports pelvic viscera, raises pelvic floor.

NOTE
6. Arcus tendineus - thickened band of fascia covering the inner aspect of the obturatopr internus.
7. Anococcygeal ligament & raphe - extends from the tip of the coccyx to the junction of the rectum & anal canal.


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REFERENCES

1. Mcminn. (2003). Last's Anatomy. Elsevier Australia. ISBN:0729537528. Read it at Google Books - Find it at Amazon
2. Netter, F. H. (2019). Atlas of human anatomy. Philadelphia, PA: Elsevier.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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