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How many vertebra does the sacrum have
5 fused vertebra
4 Ant. Features of the sacrum
Transverse lines, ant. sacral foramen, sacral alar, sacral promontory
7 Post. Features of the sacrum
Median sacral crest
Lateral sacral crest
Post. sacral foramen
Sacral canal
Sacral Hiatus
Auricular surfaces
Sup. articular facets
What fused bones make up the innominates
Ilium, Ischium, Pubis
Joints of the pelvis
Ant - pubic symphysis
Post - sacro-illiac
Sup - lumbosacral junction
Inf - sacroccocgeal
Features of the Male Pelvis
Thicker and heavier, tilted post, ilium deeper, sacrum narrower and longer, ASIS closer & less flared, oval/round obturator foramen, pubic symphysis longer
Features of the Female Pelvis
Smaller, tilted ant, shallower ilium, sacrum shorter & wider, ASIS further apart, more flared, shorter pubic symphysis.
Define Pelvic Inlet
Sup pelvic aperture, the upper opening of the true pelvis, forming a boundary between the abdominal cavity and the pelvic cavity.
What makes up the pelvic brim
formed by sacral promontory, arcuate line, pectineal line, pubic crest.
Define pelvis outlet
Inf pelvic aperture, inf pubic rami, ischial tuberosities, tip of coccyx.
What is the greater/false pelvis define its borders
Sup to the pelvic inlet, formed by the iliac crest, alae of ilium, and ant aspect of S1. part of the abdominal cavity and supports the abdominal organs.
What is the lesser/true pelvis and define its borders
Between the pelvic inlet and outlet. The coccyx, pubic symphysis, lower part of the ilium, Houses pelvic organs.
What is the pelvic girdle
A basin shaped ring of bones connecting the spine to the femurs.
How does the shape of the sacrum contribute to stability
Overall wedge shape fits between the two innominate bones.
Movements of the sacrum
nutation and counter nutation.