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Flashcards in Pelvis & Pelvic Floor Deck (30)
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1

What are the 2 regions of the pelvis separated by the pelvic rim?

1) False pelvis – above pelvic brim
- pelvic inlet continuous with abdominal cavity
- greater pelvis

2) True pelvis – below pelvic brim
- pelvic outlet closed off below by muscular pelvic floor
- lesser pelvis

2

What are the components of the pelvic girdle?

- 1 sacrum = 5 fused sacral vertebrae
- 2 os coxae = ilium, ischium & pubis

3

Explain Sexual Dimorphism of Pelvis.

- Oval pelvic brim in ♀ vs. heart-shaped in ♂
- shorter pubic symphysis in ♀
- much wider pubic arch in ♀
- more flared iliac wings (alae) in ♀
- ischial tuberosities farther apart in ♀
- sacrum shorter & less curved in ♀

*All for accommodation of childbirth

4

What are the specific features of the female pelvis?


Oval to rounded pelvic inlet = superior pelvic aperture
- pubic arch is wider with a subpubic anlge >80
- obturator foramen is oval
- acetabulum is small

5

What are the specific features of the male pelvis?


Males have thicker and heavier structure related to heavier build and larger muscles of men
- greater pelvis is deeper (no childbirth)
- lesser pelvis is narrow and deep
- pubic arch is naroow with a subpubic arch <70
- obturator foramen is round
- acetabulum is large

6

What are the ligaments of the pelvis?

- pubic symphysis - connects 2 pubic bones
- Ant. sacroiliac lig.
- Post. sacroiliac lig.
- sacrotuberous lig.
- sacrospinuos lig.
- obturator membrane - closes off obturator foramen(lower border of obturator canal
- interosseous lig.

7

Where is the sacrotuberous lig.?

- ischial tuberosity to sacrum/coccyx
- lower border of lesser sciatic foramen

8

Where is the sacrospinuos lig.?

- ischial spine to sacrum/coccyx (lower boundary of greater sciatic foramen)

9

What are the Muscles of Pelvic walls?

1) Piriformis m.
2) Obturator internus

10

What are the specifics of the Piriformis m.?

-anterior sacrum to greater trochanter
-passes behind greater sciatic notch
-closes off posterior/superior pelvic outlet
- arises in pelvis to act on hip joint
- passes thru greater sciatic foramen
- S1, S2

11

What are the specifics of the Obturator internus m.?

- obturator foramen to greater trochanter
- covered with thick fascia & attaches to levator ani as tendinous arch
- arises in pelvis to act on hip joint
- passes thru lesser sciatic foramen
- L5, S1

12

What separates the pelvic cavity from the perineum, formed by muscles and fascia?

The Pelvic Floor/Diaphragm

13

What muscles are the largest component of the pelvic diaphragm?

The 3 Levator Ani muscles:
- Iliococcygeus
- Pubococcygeus
- Puborectalis

14

What are the other muscles of the pelvic diaphragm?

Coccygeus mm.

Assisted by piriformis & obturator internus mm.

15

What is the perineum?

A diamond shaped region between thigh, made up of 2 Δs

16

What 2 Δs make up the perineum?

1) Urogenital Δ
- passage of urinary & genital systems
- deep trans. perineal mm. or UG diaphragm

2) Anal Δ
- passage of rectum & anus
- pelvic floor mm. or pelvic diaphragm

17

What are the specifics of the Deep Transverse Perineal mm. /UG Diaphragm?

- Anterior/inferior to pelvic diaphragm
- Composed of deep transervse perineal mm.
- Extends between 2 pubic arches
- Attaches posteriorly to perineal body
- Blends with sphincter mm. of urethra and vagina(♀)

18

What/where are the ureters?

- transport urine from kidneys to bladder
- cross ext. iliac vessels & descend into pelvis
- travel to posterolateral aspect of urinary bladder

*Female: uterine a. crosses ureter
*Male: ductus deferens crosses ureter

19

What the specifics of the urinary bladder?

- stores urine prior to expulsion thru urethra
- consists of smooth m. = detrusor urinae
- covered by peritoneum & supported by pelvic floor

20

What are the specifics of the female urethra?

- ~ 3.5 – 4 cm
- Pierces ant. portion of UG diaphragm between bladder and external urethral orifice

21

What are the specifics of the rectum?

- located in true pelvis superior to pelvic floor
- normally constricted by puborectal sling - U-shaped puborectalis m.

22

What are the specifics of the Anal Canal?

- emerges in anal Δ inferior to pelvic floor
- continuous with rectum at anorectal junction & produces curvature at anorectal junction (perineal flexure)
- relaxes to allow defecation

23

What are the Male Pelvic Viscera?

- Penis
- Testes -primary male reproductive organs, housed in scrotum
- Spermatic cord - fascial sheath derived from anterior abdominal wall, from inguinal canal into scrotum, surrounds ductus deferens, testicular vessels & nn.
- ductus (vas) deferens
- reproductive glands:
1) seminal vesicles - joins vas def, forms ejaculatory ducts, empty into prostatic urethra
2) prostate gland - walnut sized, btwn bladder & UG diaphragm
3) bulbourethral (Cowper’s) gland - 2 pea sized, within UG diaphragm, empty into penile urethra

24

What are the specs on the ovaries?

- primary female reproductive organs
- produces ova & female hormones - 1 ovum released per menstrual cycle
- encapsulated and housed in true pelvis

25

What are the specs on the uterine (fallopian) tubes?

- muscular tubes for transport of ovum to uterus
- open channels from peritoneal cavity to uterus- isthmus, ampulla infundibulum & fimbriae

26

What makes up the adnexa?

ovaries + uterine tubes + uterine ligaments

27

What are the specs on the uterus?

- ~7 cm long (may enlarge 20x during pregnancy)
- usually anteverted & at right angle to vaginal canal
- position changes with full bladder & pregnancy

28

What are the specs on the uterine cervix?

- inferior neck of uterus protruding into vaginal canal
- opens to vagina as external os & uterus as internal os

29

What are the specs on the vaginal fornix?

- circular gutter surrounding cervix
- deeper post. than ant.

30

What are the uterine ligaments?

1) Suspensory lig. - peritoneum covering ovarian vessels & nn.
2) Broad lig. - peritoneum covering uterus and adnexa
3) Ovarian lig. - anchors ovary to uterus
4) Round lig. of uterus - continuation of ovarian lig., passes thru inguinal canal to fuse with labia majora