Walls and Floor of the Pelvis Flashcards
What is the origin of the pubococcygeus?
Internal aspect of pubic bone and first part of obturator internus
Does the peritoneum drape over the vagina?
Yes, on the posteriosuperior surface
How does the endopelvic fascia support the viscera of the pelvis?
It condenses into ligaments
What are the three components of the pubococcygeus?
Pubovaginalis/puboprostageus - slings around the vagina and prostate
Puborectalis - slings around the rectum
Most lateral aspect - inserts into the anococcygeal raphe
Where does pus in the peritoneal cavity collect in females?
The rectro-uterine pouch aka Pouch of Douglas
Where does the obturator internus lie in the pelvis and perineum?
Half in each
What is the name of the muscle that sits on the lateral wall of the pelvis?
Obturator internus
What is levator ani? What are the names of its component muscles?
The two pelvic wall muscles that lift upwards
Pubococcygeus, Iliococcygeus
Through which foramen does piriformis exit the pelvis?
Greater sciatic foramen
What is the difference in the placement of loose and dense fascia?
Loose covers structures that move
Dense covers structures that are fixed
How does the peritoneum relate to the pelvic viscera?
It drapes over the viscera
Which ligament does the ischiococcygeal muscle follow?
Sacrospinous
What is the name of the middle aspect of the pelvic floor?
Iliococcygeus
What does the sacral plexus lie in relation to the piriformis and the endopelvic fascia?
It lies in between
Where does iliococcygeus insert?
The anococcygeal raphe
What closes the obturator foramen?
The obturator membrane
What can be done for veterans that are unable to void due to an obstructive prostate?
Insert a needle through the abdominal wall directly into the bladder with a catheter to drain the bladder
Does the pubococcygeus underlap or overlap the iliococcygeus?
Overlap
What is the name of the lowest point in the peritoneal cavity in males? Where does it lie?
The retrovesical pouch
In between the bladder and rectum
What are the clinical implications of the position of the Pouch of Douglas?
Fluid that collects within it can be palpated
A needle can be inserted into the vagina and fluid from the pouch can be aspirated
Which way does the bladder expand as it fills with urine?
Upwards into the abdominal cavity
What surrounds neurovascular structures in the pelvis?
Endopelvic fascia
What is the origin of the ischiococcygeus muscle?
Ischiospine
What branch of the internal iliac artery supplies the pelvis viscera?
The anterior branch
What is the name of the major artery of the pelvis that lines in the lateral walls within fascia?
Internal iliac
On which aspect of the pelvis does the piriformis lie?
Posterior
What is the name of the fascia of the pelvis?
Endopelvic fascia
What creates the rectoanal junction?
The slinging of puborectalis around the rectum
