Pelvis (its Contents & the Floor) Flashcards Preview

Anatomy > Pelvis (its Contents & the Floor) > Flashcards

Flashcards in Pelvis (its Contents & the Floor) Deck (36):
1

What makes up the "false" (greater) pelvis?

- the part between the iliac crests and the pelvic inlet

2

What makes up the "true" (lesser) pelvis?

- the basin-shaped cavity below the pelvic inlet

3

Which bones make up the pelvis?

- the sacrum and the hip bones on each side

4

Which three bones make up each hip bone?

- pubis, ilium, and ischium

5

What is the large foramen in each hip bone called?

- the obturator foramen

6

What converts the greater and lesser sciatic notches into the greater and lesser sciatic foramina?

- the sacrospinous and sacrotuberous ligaments

7

What is the small opening in the obturator membrane called?

- the obturator canal

8

Is the sub-pubic angle greater in males or in females?

- females
- it is V-shaped in males and U-shaped in females

9

Describe the shape of the obturator foramen in males and females.

- the foramen tends to be circular in males, and more oval in females

10

T or F: the acetabulum is generally larger in females.

- false!
- it is larger in males

11

What makes up the pelvic floor?

- the pelvic diaphragm and the urogenital diaphragm

12

What makes up the pelvic diaphragm?

- the levator ani ani the coccygeus muscles (along with the fascia above and below them)

13

What are the three parts of the levator ani muscle?

- the puborectalis
- the pubococcygeus
- the iliococcygeus

14

Where is the perineum located?

- below the pelvic diaphragm

15

What makes up the urogenital diaphragm?

- the deep and superficial transverse perineal muscles

16

T or F: the urethra pierces the urogenital diaphragm, but the anal canal does not.

- true!
- this is because the urogenital diaphragm is present only in the anterior part of the pelvic outlet, not the posterior

17

Which two muscles lie below the urogenital diaphragm?

- the isciocavernosus muscles and the bulbospongiosus

18

Where is the pudendal canal (Alcock's Canal)? What does it contain?

- on the lateral side of each ischiorectal/ischioanal fossa
- the pudendal nerve and internal pudendal vessels

19

Does the vagina pierce through the pelvic diaphragm? What about the urogenital diaphragm?

- it pierces through both!
- as does the urethra

20

Does the male urethra pierce through the pelvic diaphragm? What about the urogenital diaphragm?

- it pierces through both

21

Does the anal canal pierce through the pelvic diaphragm? What about the urogenital diaphragm?

- the anal canal pierces through only the pelvic diaphragm

22

At what point does the rectum become the anal canal?

- at the anorectal junction

23

Which part of the levator ani is involved in defecation?

- the puborectalis muscle

24

In males, what is the space/pouch of the peritoneal cavity between the rectum and the bladder known as? What about in females?

- males: rectovesical pouch
- females: rectouterine pouch (pouch of Douglas), because the uterus is located here

25

The "grooved" portion inside the anal canal that separates the rectum from the anus is known as the:

- pectinate line
- it "separates" the visceral from the parietal

26

What does each anal column (the anal columns make up the pectinate line) contain?

- a small artery and vein
- this is where hemorrhoids can form

27

Lymphatic drainage above the pectinate line mainly goes to which nodes?

- the internal iliac nodes or the nodes near the inferior mesenteric vessels

28

Lymphatic drainage below the pectinate line mainly goes to which nodes?

- the inguinal nodes

29

The internal anal sphincter is made up of _________; the external sphincter is made up of __________.

- internal: smooth muscle
- external: skeletal muscle

30

Which 4 arteries supply the lower rectum and the anal canal? Where do they originate from?

- superior rectal arteries (from the inferior mesenteric)
- middle rectal arteries (from the internal iliac)
- inferior rectal arteries (from the internal pudendal)
- median sacral artery

31

What is the main arterial supply to the pelvis and its organs?

- the internal iliac arteries and its branches

32

What are the two main branches of the internal iliac artery?

- the posterior division and the anterior division

33

Which arterial branches arise from the posterior division of the internal iliac?

- iliolumbar, lateral sacral, and superior gluteal

34

Which arterial branches arise from the anterior division of the internal iliac?

- umbilical, superior & inferior vesical, obturator, middle rectal, uterine & vaginal, internal pudendal, and inferior gluteal

35

T or F: the entire pelvic diaphragm is normally in a tonic/contracted state.

- true!
- they are in this contracted state via slow twitch muscle fibers

36

Where does the main nerve supply of the pelvic diaphragm come from?

- S2, S3, & S4
- "S2, 3, 4 keeps your asshole off the floor"