What are the three bones of the pelvic girdle? Articulations?
Sacrum and 2 Os Coxae (innominate bones). Articulations: 2 Sacroiliac (synovial and syndesmotic) and Pubic Symphysis (cartilaginous)
What role do the sacrotuberous and sacrospinous ligaments play in forming the greater and lesser sciatic foramen?
Ligaments are responsible for turning foramen into notches. Sacrotuberous ligament closes the notches off posteriorly while sacrospinous ligament divides foramen into greater and lesser portions.
Describe the orientation of the obturator foramen relative to the acetabulum? What structure runs through it?
Relative inferior and anterior. Obturator nerve (L2-L4 AD) runs through defect in superior aspect of obturator membrane.
What marks the thickest part of ilium?
Marked by arcuate line. Line leads directly to heavy superior aspect of acetabulum, which is major weight bearing portion of socket.
Decribe the bony landmarks of the pelvic inlet
In a circle=>sacral promontory, arcuate line, pectineal line of pubis, pubic tubercle
Transverse plane that separates abdominal & pelvic cavity
Pelvic Inlet (note: False Pelvis= part of abdominal cavity and True Pelvis= Pelvic Cavity)
In the auricular surface, the bony surface of the sacrum is covered with ________________ while the ilium is covered with__________________.
Sacrum:Hyaline. Ilium:Fibrocartilage. Due to multidirectional forces.
What is the main functional significance of the “pelvic diaphragm” or pelvic floor?
muscles are the major support for all the abdominal contents. Levator Ani: sheet of muscles, Coccygeus: relatively posterior. Also openings for rectum , urethra, vagina.
