Pelvis Flashcards
what is the pelvic inlet defined by?
sacral promotory, iliopectineal line, symphysis pubis
what things make up the iliopectineal line?
arcuate line of the ileum and the pectineal line of the pubis
what is it called above the pelvic inlet?
false pelvis or pelvis major
what is it called below the pelvic inlet?
true pelvis or pelvis minor
what is the pelvic outlet bounded by?
ischial tuberosity, tip of coccyx, pubis symphesis
what is is known as between the inlet and outlet?
pelvic cavity or lesser pubis
what is contained in the plevic cavity?
nerves, blood vessels, lymphatics, pelvic genital organs, rectum, terminal parts of ureters
what makes up the anterior wall of the pelvis?
pubic bone and symphesis
what makes up the posterior wall of the pelvis?
sacrum, ilia and piriformis which leaves through the GSF
what makes up the lateral walls of the pelvis?
obturator internus which leaves through the LSF
what makes up the floor of the pelvis minor?
pelvic diaphragm
what consists of the pelvic diaphragm?
levator ani, coccygeus muscles and associated fascia
what are the 3 parts of the levator ani?
puborectalis, pubococcygeus, iliococcygeus
what is the puborectalis muscle?
it is the sling around the anorectal junction
what is the main portion of the levator ani?
pubococcygeus
explain the iliococcygeus muscle?
most posterior, thin, poorly developed
what is the innervation of the levator ani?
S4 and pudendal nerve
what are the actions of the levator ani?
support the pelvic viscera and resists increase in intraabdominal pressure
what does the levator ani support during birth
the fetal head
true or false: the levator ani muscles can be injured during difficult deliveries?
true
which levator ani muscle is the most commonly damaged during childbirth?
pubococcygeus
what does the levator ani surround?
urethera, vagina, and anal canal
what are the related condition with childbirth?
urinary stress incontinence, prolapse of urinary bladder and prolapse of uterus
what are the branches of the internal iliac?
anterior and posterior
what are the branches of the anterior portion of the internal iliac?
umbilical, obtruator, uterine, vaginal, inferior vesical, inferior gluteal, internal pudendal, middle rectal
what are the branches of the posterior division of the internal iliac?
lateral sacral, superior gluteal, and iliolumbar
what are the branches of the internal iliac that is found in males?
prostatic branches of inferior vesical, prostatic venous plecus, pampiform plecus, artery to ductus deferens
what are the other arteries of the pelvis?
superior rectal, ovarian/testicular, median sacral
between what vertebrae is the sacral plexus?
L4-S4
what branches of the sacral plexus will go to the lower limb?
sciatic, superior gluteal, inferior gluteal, nerve to obturator internus, nerve to quadratus femoris, posterior cutaneous nerve of thigh
what are the nerves that go to the pelvis muscles, viscera, and perineum?
piriformis, pudendal nerve, and plevic splanchnic
