Flashcards in Wall and Floor of Pelvis Deck (20)
T/F Obturator membrane completely closes the obturator foramen
False, it leaves out the obturator canal for the obturator nerve
Which three muscles are found on the internal wall of the pevlis?
What is the origin of obturator internus?
internal surface of the obturator membrane as well as the adjacent margins
How does obturator internus exit the pelvis?
through the lesser sciatic foramen, collecting the gemelli along the way
What is the insertion of obturator internus?
What is the origin of piriformis?
the middle three pieces of the sacrum and adjacent part of the lateral mass
How does piriformis exit the pelvis?
greater sciatic foramen
What are the three parts of pelvic floor?
What are the sub-components of pubococcygeus?
pubo-vaginalis or puboprostaticus
puborectalis as the posterior sling
T/F iliococcygeus overlaps the pubococcygeus
False, it underlaps it
What is the course of ischiococcygeus?
from the ischial spine to the coccyx, on the internal surface of ischiococcygeous ligament
What is the origin of levator ani?
from internal aspect of the pubic bone along the side wall of the pelvis, half way along the obturator internus, ending at ischial spine
Can we see the origin of levator ani?
yes, the border is thickened. We can see the delineating line on obturator internus
The insertion of levator ani is via a central raphe. What's the course of this raphe?
tip of coccyx to the anal junction, hence called the anal-coccygeal raphe
T/F Loose fascia surrounds the structures that are mobile
True, like the bladder, vagina, pelvic floor
Which structures in the pelvis have dense fascia around them
piriformis, obturator internus, prostate
In relation to endopelvic fascia, why does pelvic sepsis spread so quickly?
Endopelvic fascia fills the space of the pelvis, so infection tends to follow the tissue and spread rapidly
What are the layers of the pelvis from outside to inside?
bones and joints, to muscles, to sacral plexus, to fascia, to vessels, then to viscera
Which division of internal iliac supplies the pelvic viscera?
the anterior division