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Glossary of pelvic floor

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Perineum
pelvic floor
Two divisions of Perineum
Anterior triangle = urogenial
Posterior triangle = anal
Superficial Urogenital muscles
Bulbospongiosus
Ischiocavernosus
Bulbospongiosis
superficial urogenital muscle
-origin: from collagen sheath at base of penis or clitoris.
-insertion: central tendon of perineum.
-nerve: Pudendal, s2-s4
Ischiocavernosus
superficial muscle of urogenital triangle.
-origin: ischial tuberosity
-insertion: symphysis pubis, to base of penis or clitoris.
-Stiffens erectile tissue (penis/clit)
Deep muscles of Urogenital Triangle
Urogenital Diaphragm
-Deep transverse perineus
-Urethral Sphincter
Deep transverse perineus
origin - ischial ramus
insertion - median raphe of urogenital diaphragm
This is the base of the triangle.
Urethral Sphincter
deep muscle of urogenital diaphragm
-ring surrounds the urethral opening
Innervation of all the pelvic floor muscles except coccygeus
PUDENDAL S2-S4
superficial transverse perineal
superficial urogenital muscle;
makes the bottom line of the anterior triangle
Muscles of the posterior triangle
-Coccygeus
-External Anal Sphincter
-Levator Ani
Coccygeus
muscle of anal triangle; at the back.
-from ischial spine to lateral saccrum
INNERVATED BY S4-S5
External Anal Sphincter
Muscle of posterior anal triangle.
-ring around the anus
Levator Ani
-Iliococcygeus
-pubococcyeus
Iliococcygeus
-from ishial spine to coccyx and median raphe
elevates/contracts anus
pubococcygeus
from pubis to coccyx and median raphe
-elevates/contracts anus with iliococcygeus. Pudendal nerve

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