Flashcards in Appendicular Skeleton: Pelvic Girdle Deck (4)
Includes both appendicular and axial bones (sacrum and coccyx)
"Hip bones" + sacrum + coccyx = pelvis
Attaches the lower limbs to spine (body weight passes through girdle to lower part of axial skeleton) and supports viscera
Strong attachment to axial skeleton at sacroiliac joint (very stable)
Less freedom of movement compared to pectoral girdle
Os coxae is composed of 3 bones: ilium, ischium, and pubis. These fuse by adulthood
Acetabulum is lateral socket where the head of femur articulates. Composed of all 3 pelvic bones.
2 hip bones join to each other anteriorly at the pubic symphysis
Pelvic Inlet and Pelvic Outlet
Pelvic Inlet defines the boundary between pelvic and abdominal cavities (or greater and lesser pelvis; or true and false pelvis)
Pelvic Brim: edge of pelvic inlet
Pelvic Outlet: inferior opening defined by ischial tuberosities (it's the bony feature you sit on).
The size of this outlet and inlet is important for a successful birth