Anatomy - Pelvis & Perineum Flashcards
What bones make up the innominate bone?
Ischium
Pubis
Ilium
What structures form the pelvic brim?
Pubic symphysis
Superior pubic ramus
Acruate line of the ilium
Ala of the sacrum
Sacral Promontory
What angle is the pelvic brim at?
Around 60 degrees
What are the differences between a femal and male bony pelvis?
Wider and deeper
Pubic arch angle is broader
Inferior pelvic aperture is larger in all directions
Which ligaments support the sacro-iliac joint?
Anterior sacro-iliac ligament - infront
Posterior sacro-iliac ligament - behind
Sacrotuberous - from sacrum to ischial tuberosity
Sacrospinous - from sacrum to ischial spine
Which ligamentous structures divide the sciatic notch of the pelvis into the greater and lesser sciatic foramen?
Sacrotuberous - from sacrum to ischial tuberosity
Sacrospinous - from sacrum to ischial spine (lies more anteriorly)
Which structures form the inferior pelvic aperture?
Ischiopubic rami anteriorly
Sacrotuberous ligament posteriorly
Which muscles form the pelvic diaphragm?
Coccygeus (small) - posteriorly
Levator ani (large) - anteriorly
Origin and insertion of Levator Ani
Anterior- body of the pubis
Middle - tendinous arch of the obturator fascia
Posterior - ischial spine
Muscles bilaterally meet in the midline inserting onto the anococcygeal fibrous ligament
What is the gap in the Levator Ani through which the rectum, urethra and in females the vagina exit?
Urogenital hiatus
Which structures form the boundaries of the perineum?
Coccyx
Sacrotuberous ligament
Iscial tuberosities
Ischiopubic rami
Pubic symphysis
Boundaries of the urogenital triangle?
Pubic symphysis
Ischiopubic rami
Ischial tuberosities
Which nerve roots contribute to the pudendal nerve?
S2,3,4
