Pelvic Walls and Floor Flashcards

1
Q

What are the posterior and anterior pelvic boundaries?

A

Bony walls

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2
Q

What is the lateral pelvic boundary?

A

Bony and muscular walls

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3
Q

What is the inferior pelvic boundary?

A

Muscular at the pelvic outlet

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4
Q

What is the superior pelvic boundary?

A

Is the inlet to the abdominal cavity

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5
Q

What is the function of the greater and lesser sciatic notches?

A

To allow the passage of nerves, arteries, veins and muscles from the internal surface of the pelvis to the perineum and gluteal region

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6
Q

What turns the sciatic notches into foramen?

A

The presence of ligaments

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7
Q

What foramen allows the anterior part of the pelvis to be lighter?

A

Obturator foramen

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8
Q

What structures keep the foramen closed?

A
  • Obturator internis
  • Obturator externis
  • Obturator membrane
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9
Q

The obturator foramen is pierced by what structures?

A

Obturator nerve and vessels

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10
Q

What structure is a bony landmark for the pudendal nerve?

A

Ischial spine

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11
Q

What is the name of the bone at the site of the hip joint where the ball and socket joint forms with the femur?

A

Acetabulum

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12
Q

What do the iliac blades provide attachment for anteriorly and posteriorly?

A

Anterior - iliacus

Posterior - gluteus muscles

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13
Q

What structures of the pelvis are attachment sites for the inguinal ligament?

A

Anterior superior iliac spine

Pubic tubercle

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14
Q

What nerves pass through the sacral foramen to exit the vertebral column and supply the structures within the pelvis and lower limb?

A

Sacral nerves

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15
Q

What two large ligaments attach to the sacrum?

A
  • Sacrotuberous

- Sacrospinous

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16
Q

What is the distal attachment of the sacrotuberous ligament?

A

The ischial tuberosity

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17
Q

What is the distal attachment of the sacrospinous ligament?

A

The ischial spine

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18
Q

Together, the sacrospinous and sacrotuberous form what strcuture?

A

The greater and lesser sciatic foramen

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19
Q

How is the inguinal ligament formed?

A

The aponeurosis of external oblique as it rolls over itself to form the anterior wall and floor of the inguinal canal

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20
Q

What type of joint is the anterior sacroiliac joint and what ligament protects it?

A

Plane synovial joint protected by the anterior sacroiliac ligament

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21
Q

What type of joint is the posterior sacroiliac joint and what ligament protects it?

A

Fibrous joint supported by the posterior sacroiliac ligament

22
Q

Whatis the name of the classic female shape of the pelvis inlet?

A

Gynecoid

23
Q

What is the name of the classic male shape of the pelvic inlet?

A

Android

24
Q

What is the name given to a more flattened pelvic inlet in an anterior posterior direction?

A

Platypelloid

25
Q

What is the name given to a wider pelvic inlet in an anterior posterior direction?

A

Anthropoid

26
Q

What nerve innervates the iliacus muscles?

A

Femoral nerve

27
Q

What is the action of the iliacus muscle?

A

To flex the hip

28
Q

What nerve innervates the psoas muscle?

A

Anterior rami of L2-L4

29
Q

What is the action of the psoas muscle?

A

Flex the hip

30
Q

What is the main action of the obturator externus muscle?

A
  • to abduct the thigh

- to laterally rotate the thigh

31
Q

What muscle attaches to the membrane and sends its tendons through the the lesser sciatic notch to reach the femur?

A

Obturator internus

32
Q

What tendon runs between the two glamelli muscles?

A

Obturator internus

33
Q

What muscle is a useful landmark in the pelvis as the sciatic nerve and pudendal nerve form on its superior surface?

A

Piriformis

34
Q

What is the main function of the piriformis muscle?

A

To support the pelvic wall by partially covering the opening of the greater sciatic foramen

35
Q

What two muscle blocks form the pelvic diaphragm?

A
  • Levator ani (anteriorly)

- Coccygeus (posteriorly)

36
Q

What is the main function of the coccygeus muscle and what nerve is it innervated by?

A
  • To flex the coccyx

- Direct branches from the sacral plexus (S4-5)

37
Q

What are the two divisions of the levator ani?

A
  • Pubococcygeus

- Iliococcygeus

38
Q

What is the main function of the pubococcygeus muscle?

A

To support the vagina, prostate and rectum

39
Q

What provides the levator ani with motor innervation?

A
  • Nerve to levator ani

- Pudendal nerve

40
Q

What two sections of the pubococcygeus muscle are found in males?

A
  • Levator prostatae

- Puborectalis

41
Q

What two sections of the pubbococcygeus muscle are found in females?

A
  • Pubovaginallis

- Puborectalis

42
Q

What nerve innervates the pubococcygeus muscle?

A
  • Pudendal nerve

- Nerve to levator ani

43
Q

What is the main function of the puborectalis muscle?

A

To maintain continence by bending the rectum

44
Q

What nerve innervates the puborectalis muscle?

A
  • Pudendal nerve

- Nerve to levator ani

45
Q

What is the attachment site for the Iliococcygeus muscle?

A

Tendinous arch of levator ani

46
Q

What nerve innervates the iliococcygeus muscle?

A
  • Pudendal nerve

- Nerve to levator ani

47
Q

What muscles from the pelvic region attach to the perineal body?

A
  • Levator prostatae
  • Pubovaginalis
  • External anal sphincter
48
Q

What pelvis fascia covers the internal wall?

A

Parietal pelvic fascia

49
Q

What pelvis fascia covers the organs?

A

Visceral pelvic fascia

50
Q

What pelvis fasica acts as packing material around the organs?

A

Endopelvic fascia