Pelvis Flashcards
Name the bony elements of the pelvic girdle
- 2 innominate: ilium, ischium, pubis
- sacrum
- coccyx
Which structures form the boundaries of the pelvic inlet
pelvic inlet:
- sacral promonotory
- arcuate line
- pectineal line
- pubic symphysis
divides pelvis into greater (false) and lesser (true)
Describe the divisions of the pelvis
- abdominal cavity
- false greater pelvis
- true lesser pelvis
List the ways the male and female pelvis differ from one another
male: subpubic angle 70 degrees heart shaped inlet narrow outlet narrow cavity narrow, convex sacrum
female: subpubic angle 90-100 degrees oval shaped inlet roomy outlet roomy cavity wide, flat sacrum
Name the four parts of the male urethra
- preprostatic (neck of bladder)
- prostatic
- membranous
- spongy
Describe the basic structure of the female internal reproductive organs
female gonads
-composed of dense fibrous tissue in which ova are produced and discharged from follicles (ovulation)
which structures form the pelvic outlet
- coccyx
- sacrotuberous lig
- sacrospinous lig
- ischial tuberosities
- pubic arch
Name the pelvic joints and the ligaments that cross them
SI joint and pubic symphysis
ligaments: stabilize SI joint
- Anterior sacroiliac ligaments
- sacrospinous ligament: good boundary between greater and lesser foramen
- sacrotuberous ligament
- iliolumbar
- anterior logitudinal
what kind of joint is the SI
plane
what kind of joints are the pubic symphysis and lumbosacral
symphysis
where does the iliacus attach
iliac fossa to lesser trochanter
what is the action of the iliacus
hip flexion
what is the innervation of the iliacus
femoral
what are the attachments of the psoas major
transverse processes T12-L4 to lesser trochanter
what is the innervation of the psoas major
ventral rami L1-3
what is the attachment of the piriformis
sacrum to greater trochanter
what are the actions of the piriformis
lateral rotation
what are the attachments of obturator internus
obturator membrane to greater trochanter
what are the action of the obturator internus
lateral rotation
what are the attachments of the coccygeus
sacrospinous ligament to coccyx
what are the actions of coccygeus
support and compress pelvic floor
what is the innervation of cocygeus
ventral rami S4-5
what is the attachment of iliococcygeus
ichium and tendinous arch of obturator internus to coccyx and midline raphe
what is the action of iliococcygeus
support pelvic viscera
what is the innervation of iliococcygeus
- levator ani nerve S4
- inferior rectal n (pudendal S3-4)
- coccygeal plexus
what are the attachments of pubococcygeus
pubic and tendinous arch of obturator inernus to coccyx and midline raphe and walls of prostate or vagina
what is the action of pubococcygeus
support pelvic viscera and compress vagina
what is the innervation of pubococcygeus
- levator ani nerve S4
- inferior rectal n (pudendal S3-4)
- coccygeal plexus
what are the attachments of puborectalis
pubis and wall of rectum
what is the action of puborectalis
maintain fecal continence
what is the innervation of puborectalis
levator ani n S4
what are the actions of bulbospongiosus
F: constricts vaginal orifice and erection of clit
M: empties urethra, erection, contracts during ejaculation
what is the innervation of the bulbospongisosu
perineal brr of pudendeal n
what is the action of the ischiocavernosus
compresses crus during erection
what is the innervation of ischiocavernosus
perineal branch of pudendal
what is the innervation of ext anal sphicnter
inferior rectal branch of pudendal
what is the attachments of ext urethral sphincter
surrounds urethra
what is the aciton of ext urethral sphincter
compresses uretha
what is the innervatino of ext urethral sphincter
perineal br of pudendeal
