Lecture 18 - Pelvic muscle and fascia Flashcards Preview

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Flashcards in Lecture 18 - Pelvic muscle and fascia Deck (29):
1

The obturator foreamen is closed off by what?

obturator membrane - leaves only the obturator canal

2

where are these 3 muscles located:

obturator internus

levator ani

piriformis

obturator internus - lateral wall

levator ani - pelvic floor

piriformis - posterior wall

3

where does obturator internus arise from?

internal surface of obturator membrane - extends to the margins of the obturator foreamen

exits via the lesser sciatic foramen - converges and goes to the gluteal region

4

Piriformis arises from the middle 3 pieces of the sacrum on the _____ surface

anterior surface of the middle 3 pieces

5

where does piriformis exit?

via the greater sciatic foramen - heads for the greater trochanter

6

levator ani is basically the..

pelvic floor

7

levator ani is suspended from the side wall - what is its lateral origins (3 parts)

A thickening of the fascia overlying obturator internus

8

With levator ani, there is a large opening _____ -_______to the region below called the perineum

There is a large opening antero-medially to the region below called the perineum

9

half of obturator internus is above ___ ___

levator ani

other half is below in the perineum

10

The rectum becomes the anal canal at the level of the ___ ___

pelvic floor - lev ant. interdigitate at the midline rafe, at the ano-rectal junction

11

what are 2 componenets of levator ani?

pubicoccygeus

iliococcygeus

12

pubicoccygeus arises from what?

pubic bone - most anterior part

13

pubicoccygeus has a sling that extends where? whats it called?

why is it important?

from the pubic bone, around the anal- rectal junction and blends with the fibres of the ano-rectal junction

defacation can only ocur when puborectalis is relaxed

14

In the male/female what is the most anterior slight for pubococcygeus?

pubo-prostaticus

15

The non-slight parts of pubococcygeus (the hammock) is from where to where?

side wall of the pelvis and insert on the ano-coccygeal rafe - as we would expect from levator ani

16

how is pubococcysegeus delineated from iliococcygeus?

pubococcysegeus is the ANTERIOR fibres, overlaps iliococcygeus when you look down on the pelvic floor

Pubo.c has the slights
ilio.c is a simple hammock

17

iliococcygeus+pubococcysegeus =

LEVATOR ANI (LIFT THE ANUS)

18

What muscle extends from the ishial spine to the coccyx/sacrum?

ishiococcygeus (ishio.c)

19

What is the significance of ishiococcygeus ?

disappearing from the species - used to wag tail

not part of levator ani because its not functional in lifting the anus

20

what are levatorani's functions?

increasing intra abdomino-pelvic pressure alongside with the diaphragm - assists all evacuation processes/

To maintain and support the position of pelvic viscera

rotation during childbirth

21

The parietal fascia is not as dense over which muscle in the pelvis, why?

levator ani - it has to lift up

22

the parietal fascia of the pelvis is a continuation of the....

anterior abdominal wall (fascia transveraslis anteriorly, posterior ado. wall posteriorly)

23

The visceral fascia in the pelvis is continuous with..

the extrperitoneal fat layer of the abdomen

24

There are thickening (ligametns )visceral fascia around what in the pelvis?

vessels and nerves

condensation of visceral fascia - when they become engorged - create strong support

25

The nerves and vessels are "glued to the muscle" by...

fascia

26

Obturator nerves comes off the _____ _____ and now crosses the ______ _____and runs on the side wall, through the _____ canal

Obturator nerves comes off the lumbar plexus and now crosses the pelvic brim and running on the side wall, through the obturator canal

27

What fascia does the obturator nerve supply?

parietal - pain referred to medial side of the thigh (just above the knee)

28

The nerve supply to the peroneum is the

pudendal nerve - really imporatnt branch of the sacral plexus

29

From the internal iliac artery there is what brancheds?

posterior and anterior branches - give give rise to parietal branches for the wall and visceral branches for the viscera