Bones of the Pelvis Flashcards
Bones of the pelvis are
Ilium, ischium, pubis
3 main surfaces of the ilium
Gluteal Surface
Iliac Surface
Sacral Surface
Pubic Tubercle is
Site of insertion of the inguinal ligament
How mani rami does the pubic has? which one connects with the ischial ramus?
2: Superior and Inferior*
site onto what sit? also the site for insertion of the hamstrings?
Ischial Tuberosity
What are the limits of the obturator foramen?
Inferior Pubic Ramus
Ischial Ramus
The sacrum is made of how many vertebrae?
5
in the sacrum the transverse processes are fused to form? what sits at the top of them?
Lateral Masses
Ala
What is the Sacral Promontory?
Anterior Margin of the vertebral body that is raised
What is the structure that divides the true from the false pelvis?
Iliopectineal Line (Pectineal line + Arcuate line) The true pelvis is what is contained between the pelvic inlet and the pelvic outlet (aka from the iliopectineal line downwards)
What are the borders of the pelvic inlet?
Top of the pubis Symphysis Superior Pubic Crest Pectineal Line of Pubis Arcuate Line of Ilium Anterior Alar Margin Anterior line of promontory
What is the term used to describe the shape of the pelvic inlet in females? why is it this shape?
Gynaecoid (wider transversally)
in order for the head of the baby to go through
What is the described shape of the pelvic outlet? what are its delimitations?
diamond shaped
Inferior margin of pubic symphysis
tip of the Coccyx posteriorly
ischial tuberosity
What is the “plane of least dimensions”?
Plane that goes from S4 to the base of the symphysis pubis at the level of the ischial tuberosity
–> Structure that makes the head of the baby turn so it is able to fit in the pelvic outlet (head needs to go from traverse to vertical)
What is the main structures that provides the iliosacral joint with stability?
Interosseous Sacroiliac Ligament
Anterior and Posterior Sacroilial ligament to some extent too
