Abdomen Lecture Notes Pt. 3 Flashcards
Common in women after they give birth
Pelvic organ prolapse
Transmits the force of body weight to lower limbs and helps to protect pelvic visceral structures
Pelvis
What are the three pelvic ligaments
- ) Sacroiliac
- ) Sacrospinous
- ) Sacrotuberus
Prevent sacrum and coccyx from rocking posteriorly and superiorly as we stand and move
Sacrospinous and sacrotuberous ligaments
Bony line where the pelvis communicates with the abdomen
Pelvic brim
Above the pelvic brim is the
Abdomen
Below the pelvic brim is the
Pelvis
Space between the pelvic brim is the
Pelvic inlet
Located below the pubic bone
Pelvic outlet
Separates the false pelvis (pelvic fossa) from the true pelvis (pelvic cavity)
Pelvic Brim
Located from the pelvic brim up to the iliac crest
Fase pelvis
Suspended by the side walls of the bony pelvis
Pelvic Floor
Extends from the pelvic floor to the pelvic brim
True pelvis
Below the pelvic floor is the
Perineum
What are the three pelvic foramen?
- ) Greater sciatic foramen
- ) Lesser scietic foramen
- ) Obturator foramen
Connects the true pelvis with the gluteal region
Greater sciatic foramen
What passes through the greater sciatic foramen?
- ) Sciatic nerve
2. ) Piriformis
Connects the gluteal region with the perineum
Lesser sciatic foramen
What passes through the lesser sciatic foramen?
Pudendal nerve and internal pudendal vessels
Connects the pelvis to the medial thigh
-Obturator nerve passes through
Obturator canal
Which three things pass from the pelvis to the perineum by going directly through the pelvic floor?
Urethra, vagina, and anal canal
Has a wider pelvic inlet and outlet, and the subpubic (infrapubic) angle is 90 degrees
-transverse dimension exceeds anteroposterior dimension
Female pelvis
What is the subpubic (infrapubic) angle in males?
60 degrees
Feeling the ischial spines allows us to measure the transverse diameter of the
Pelvic outlet
The musculature of the pelvic floor is suspended like a
Hammock
Forms the lateral side walls of the pelvic floor
Obturator internus muscle
The extraperitoneal layer is continuous with the
Subperitoneal space
Continues down into the pelvis and becomes the endopelvic fascia
Transversalis fascia
Skeletal muscle floor that supports the pelvic viscera (bladder, rectum, uterus)
Pelvic diaphragm (pelvic floor)
Provides sphincter control over the urethra, vagina, and anal canal
Pelvic diaphragm (floor)
Increasing intraabdominal pressure increases
Intrapelvic pressure
Separates the true pelvis from the perineum
Pelvic diaphragm
During inspiration, the diaphragm descends which increases pressure on the
Pelvic floor
As the diaphragm descends, the pelvic floor
-contracts around urethra and anal canal
Ascends
Goes from body of pubis all the way back to the ischial spine
Tendinous arch of levator ani (Muscular white line)
The attachmentsite of the pelvic floor to the side walls
Muscular white line
Main muscle of the pelvic floor
covered with fascia called the pelvic diaphragm
Levator Ani
Forms lateral muscular walls of pelvis and ischioanal fossa
- superior part in pelvis
- inferior part in perineum
- LATERAL rotator of hip
Obturator internus
Layered on top of the sacrospinous ligament
Coccygeus muscle
Thickening of obturator internus fascia that serves as the attachment site for the levator ani muscle
Muscular white line (Arcus tendineus levator ani)
Innermost layer of the levator ani, which creates the anorectal angle at the anorectal junction
Puborectalis
Contraction of the puborectalis maintins
Fecal continence
Second layer of the pelvic floor and also the largest portion of the muscular pelvic floor
Pubococcygeus