pelvic floor/perineum Flashcards
what muscles make up the lateral walls of the true pelvis
obturator internus
piriformis
what muscles make up the inferior lining of the true pelvis
pelvic floor muscles/pelvic diaphragm
what separates the pelvic cavity and perineum
pelvic floor
what are the two gaps in the pelvic floor for
urogenital hiatus - urethra +/- vagina
rectal hiatus - anal canal
where is the perineal body
between urogenital hiatus and anal canal
what is the perineal body and what does it do
fibrous node that joins the pelvic floor to the perineum
what muscles attach to the perineal body
bulbospongiosus
superficial and deep transverse perineal muscles
external anal and urethral sphincters
what are the functions of the pelvic floor
support abdominopelvic viscera
resist increased inter-pelvic/abdominal pressure
maintain continence
what are the main muscles of the pelvic floor
levator ani
coccygeus
what is the innervation of the levator ani muscles
pudendal nerve
S4 branch
what are the three sets of paired muscles that make up the levator ani
pubococcygeus
puborectalis
iliococcygeus
puborectalis
U shaped ring
puborectalis attachments
bodies of pubic bones
what is the function of puborectalis
contracts to maintain faecal continence
some fibres help maintain urinary continence
pubococcygeus
what are the attachments of pubococcygeus
pubic bone (lateral to pubococcygeus) to coccyx and anococcygeal ligament
iliococcygeus