Flashcards in Pelvic Walls Deck (44):
What are the subdivisions of the pelvis?
Two lateral walls, a posterior wall, and a floor
The bony framework of the lateral wall is what part of the hip bone?
That which lies below the pelvic brim
What two things primarily cover the lateral wall of the pelvis?
Obturator internus muscle and obturator fascia
What makes up the bony framework of the posterior wall of the pelvis?
Sacrum and coccyx
Is the posterior wall convex or concave anteriorly?
What covers the lateral portion of the posterior wall of the pelvis?
Piriformis muscle and coccygeus (ischiococcygeus) muscle
Why is the floor of the pelvis more important among humans than other mammals?
Because we walk upright
What two things make up the pelvic floor?
Peritoneum (above) and pelvic diaphragm (below)
What is the space located between the rectum and bladder called?
What is the lowest point in the peritoneum of the male?
What is the space located between the rectum and uterus?
What is the space located between the bladder and uterus?
What is a less common but possible site for ectopic pregnancy of the pelvic wall area?
Ascites and blood can pool in which downward reflections of the peritoneum?
Rectovesical or rectouterine pouch
What is the major support structure for pelvic viscera?
The pelvic diaphragm consists of which muscles?
Coccygeus (ischiogoccygeus) and levator ani muscles
What is the major constituent of the pelvic diaphragm?
Levator ani muscle
What is the opening of the pelvic diaphragm that transmits the urethra in males and both the urethra and vagina in females?
What is the opening of the pelvic diaphragm that is found in both sexes?
What is the origin of the coccygeus muscle?
Ischial spine and sacrospinous ligament
What is the insertion of the coccygeus muscle?
Coccyx and lower part of sacrum
What is the nerve supply of the coccygeus muscle?
Anterior primary rami of 3rd and 4th sacral nerves
What is the function of the coccygeus muscle?
Supports pelvic viscera, draws coccyx forward
What is the origin of the levator ani muscle?
Body of pubis, tendinous arch, ischial spine
What is the insertion of the levator ani muscle?
Coccyx and anococcygeal ligament
What is the nerve supply of the levator ani muscle?
Anterior primary rami of 3rd and 4th sacral nerves, perineal branch of pudendal nerve
What is the function of the levator ani muscle?
As a whole, supports pelvic viscera. Specialized parts of the levator ani perform other functions
What is the shape of the levator ani muscle?
What are the three parts of the levator ani muscle?
Iliococcygeus, pubococcygeus, and puborectalis
What is the most posterior part of levator ani?
What is the main part of levator ani?
What part of the levator ani is located around the urogenital hiatus?
What part of the pubococcygeus forms a sling around the urethra beneath the prostate in the male?
What part of the pubococcygeus forms a sling around the urethra and vagina in the female?
What part of the pubococcygeus attaches to the anorectal junction?
Which parts of the pubococcygeus function in micturition?
Puboprostaticus and pubovaginalis
What is micturition?
What is the most important muscle for maintaining fecal matter (other than the anal sphincter)?
Where is puborectalis located?
Behind the anorectal junction as a sling
What is the function of puborectalis?
Maintains angle at the anorectal junction (perineal flexure)
When is puborectalis relaxed?
What is an extra function of puborectalis?
Directs the fetal head forward during parturition
What is the tendinous arch of levator ani?
Curved thickening of the obturator fascia which gives origin to parts of the pubococcygeus and iliococcygeus