L8 Pelvic Floor and Walls

Question 1

Hip bones are connected to each other and the sacrum via?

Answer 1

Pubic Symphysis

Sacroiliac Joints

Question 2

______________
– Above pelvic inlet
– Between the iliac wing
– Contains GI/GU

Answer 2

Grater (False) Pelvis

Question 3

____________
– Bony-walled space between pelvic inlet
and pelvic outlet
– Skeletal framework for pelvic cavity
– Bounded inferiorly by pelvic diaphragm (floor)

Answer 3

Lesser (true) pelvis

Question 4

Boundaries of Pelvic Inlet/Brim?

Answer 4

Ilium (Arcuate Line)
Pubis (Pectineal Line/Pubic Crest)
Sacrum

Question 5

Boundaries of Pelvic Outlet?

Answer 5

Pubis (Pubic Arch/Subpubic Angle)
Ischia (Ischial Tuberocities)
Sacrum and Coccyx (lateral Margins)

Question 6

Pelvic Measurements Significant in _________

Answer 6

Obstetrics

Int & ext measurements performed by transvaginal sonography provide info on size/shape of bony boundaries of lesser pelvis (birth canal)

Question 7

Sexual Dimorphisms in the Pelvis?

Answer 7

Question 8

Inferior to Pelvic Cavity?

Answer 8

Pelvic floor (diaphragm) suspended above (but descends to level of) pelvic outlet

Question 9

Answer 9

Question 10

Role of the Peritoneum

Answer 10

Mucous membrane w/ connective tissue

Secretes: Antibodies/Nutrients
Waste Removal
Allows organs to move

Question 11

Two recesses of the Female Peritoneum

Answer 11

vesicouterine recess (b/n Bladder and Uterus)

rectouterine recess -aka. Pouch of Douglas (b/n Rectum and Uterus)

Question 12

What is used to access the ovaries surgically?

Answer 12

Pouch of Douglass

Question 13

Answer 13

Question 14

What is essential for the integrituy of the pelvic floor, esp in females?

Answer 14

Perineal Body (central tendon of perineum)

– Rupture during delivery
– Predisposes to prolapse of uterus, rectum, or urinary bladder

Question 15

Keeps the anal canal and orifice shut?

Answer 15

External anal sphincter

Question 16

What muscle of the pelvic floor:
supports emptying urethra in the last part of micturition

covers bulb of penis or vestibular bulb
important for erection
ejaculation
orgasm

Answer 16

Bulbospongiosus

Question 17

What muscle of pelvic floor:
flexes the anus

Stabilize the erect penis and tense the vagina during orgasm

Retards return of blood of veins by pressure on crus penis – important for erection

Answer 17

Ischiocavernosus Muscle

Question 18

What muscle of the pelvic floor:
Fixation of the perineal body (central tendon of perineum)

support of the pelvic floor

expulsion of semen in males and last drops of urine inboth sexes

Answer 18

Superficial and deep transverse perineal

Question 19

What muscles converge at the Perineal Body?

Answer 19

External anal sphincter

Bulbospongiosus

Ischiocavernosus

Superficial and deep transverse perineal

Question 20

Pear shaped, muscle besides glutaeus medius, lateral rotator of hip for walking

Answer 20

Piriformis

Question 21

Main nerve of perineum & chief sensory nerve of ext genitalia?

Answer 21

Pudendal Nerve

Question 22

The Pudendal nerve leaves pelvis w/ ______________ artery through ___________ sciatic foramen b/t _______ & _______ muscles, hooks around _______ & ________, enters
perineum through ________ sciatic foramen

Answer 22

The Pudendal nerve leaves pelvis w/ internal pudendal artery through greater sciatic foramen b/t piriformis & coccygeus, hooks around ischial spine & sacrospinous lig, enters
perineum through lesser sciatic foramen