The document reviews the anatomy and imaging of pelvic muscles, specifically in relation to obstetrics and gynecology. It discusses the origin, insertion, action, and innervation of pelvic floor muscles, including the levator ani and external anal sphincter. The text highlights the impact of childbirth on pelvic floor integrity, particularly the risk of rupture and subsequent prolapse.

1. Applied anatomyandimaging
ofthepelvicmuscles
REVIEW ANATOMY OF OBS/GYN
WRITTEN BY: DRLOWTALKSOG

3. Origin
Insertion
Action
Innervation

4. Origin:
Insertion
Action
Innervation:

5. Origin
Insertion
Action
Innervation :

6. Origin:
Insertion:
Action:

7. • The most anterior fibres
anteroposterior
(a supplementary,
but significant sphincter of
vagina)

8. a “sling” of muscle
external anal
sphincter perineal
body.

9. pudendal nerve
direct branches of sacral
nerves
• Evidence
w/o
levator ani nerve
S3,S4 &/S5
coccygeus & levator ani m.
sacral foramina

10. Origin:
Insertion:
Actions
Innervation:
• Completing the
muscular diaphragm of
the pelvic floor

11. pelvic
viscera,
inferior fascia
ischioanal fossa
obturator internus m.

13. Damage to the pelvic floor muscles occurs
during birth. As the pubovaginalis portion of the
levator muscle is attached to the perineal body,
rupture of the latter can divide the levator
muscles and may later predispose to
uterovaginal prolapse.

14. Origin
Insertion
Actions:
Innervation:

15. btwn the inferior
& superior fascia of the urogenital
diaphragm.

16. Origin:
Insertion:
Action
Innervation:

17. Thank you
for your attention!
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WRITTEN BY: DRLOWTALKSOG