Sacrum + Pelvis Flashcards
Base of the sacrum
Sup surface of vertebral body S1
Sacral promontory
Ant surface of sacrum is more concave in
Males
How many sacral foramina are there
4 on either side for S1-4 sacral nerves (5th goes out hiatus)
At the end of the mediun sacral crest appears an oppening called
sacral hiatus
How many posterior sacral foramina are there and what exits from them
4 pairs
-corresponding numerical post ramus sacral nerves s1-4
Sup facet shape
wide, oval, concave `
Lateral surface of sacrum features
- Auricular surface for sacroiliac joint
- Sacral tuberosity for intermediate sacroiliac ligaments
- Sup epipheseal rim
What protects the caudal equina
dural sac up until 2nd sacral segment, then lower sacral nerves with dural sleeves
What is it called when L5 fuses with sacrum
sacralization of L5
What is it called when S1 detaches and becomes a lumbar vertebrea
Lumberization of S1
The axis of rotation of Si joint is
transverse axis passing through the s1 vertebrea
Is the weight of the body transmitted to the sacrum ant or post to the axis of rotation
ant
What resists rot of sacum
Sacrotuberous and sacrospinous ligaments
Nutation vs counternutation
nutation- base of scarum rotates ant
