Muscles of the pelvic diaphragm Flashcards
What are the muscles of the pelvic diaphragm?
coccygeus M
levator ani M
What compose the levitator ani?
puborectalis,
pubococcygeus,
iliococcygeus MM.
Why is obturator internus important to the pelvic girdle
levator ani M originate in part from a tendinous arch that spans the obturator internus M on the medial side.
What is the origin and insertion of puborectalis?
origin -posterior face of medial pubis
insertion - onto itself wrapping around the rectum
What is the origin and insertion of pubococcygeus?
origin posterior face medial pubis, tendinous arch
insertion - anterior face of coccyx and sacrum
what is the origin and insertion of illiococcygeus?
origin- tendinous arch, ischial spine
insertion - lateral face of coccyx and anococcygeal ligament
What is the origin and insertion of Ischiococcygeus (coccygeus) ?
origin - ischial spine, sacrospinous ligament
insertion - lateral face of coccyx and adjacent border of sacrum
What is the action of puborectalis?
supports rectum,
assist in anal sphincters to prevent incontence
What is the action of pubococygeus?
supports pelvic organs,
helps control flow of urine
contracts during orgasm
What is the action of illiococcygeus?
supports pelvic organs
What is the action of ishiococcygeus?
supports pelvic organs
pulls coccyx forward after defection
What is the innervation of the pelvic diaghphragm MM?
levator ani S2-S4
Coccygeus S3-S5
direct branches of sacral spinal nerves
What does the relaxation of the puborectalis does?
assist rectal sphincters
allows anus and rectum to com in direct alignment assisting in defection
What are raphe in the pelvic diaphragm?
a seam where the two halves of muscle meet
keeps the contraction more spread out
What is internal sphincter?
part of the circular layer of the wall of the rectum
