Pelvis and Perineum Flashcards
What 3 bones make the innominate bones?
Ilium
Ischium
Pubis
Aka coxal bones or os coxae
What makes up the pelvic girdle?
Innominate
Sacrum (5 fused bones)
Coccyx (4 fused bones)
What is the joint between the 2 innominates called?
Pubic symphysis
Learn pelvic girdle landmarks
What is the superior pelvic cavity border made from?
Pelvic inlet (abdominal cavity)
What is the inferior pelvic cavity border formed from?
Pelvic diaphragm (below this: perineum)
What forms the lateral pelvic cavity border?
(Hip bones), obturator internus muscle
What forms the anterior pelvic cavity border?
Public bones (pubhc symphysis)
What forms the posterior pelvic cavity border?
Piriformis muscle
Sacrum and coccyx
What is the roof of the pelvic cavity formed by?
- The promontory and ala of Sacrum
- The right and left linea terminalis
(Arcuate line, pectineal line and pubic crest)
What does the roof of the pelvic cavity do?
- Marks the plane of the pelvic inlet
- Separates the true and false pelvis
Compare the male and female sacrum
Female sacrum is wider and shorter
Female sacral curvature is more prominent
Male sacral promontory is more ventral
Compare the male and female coccyx
Female coccyx is more movable
Female straighter, male curves more ventrally
Compare male and female greater sciatic notch
Female: wider but shallower
Male: narrow but deep
Compare the male and female pelvic inlet
Female: wider, oval from side to side
Male: narrow, basically heart shaped
