Bony Pelvis

Question 1

What are the three components of the bony pelvis?

Answer 1

Sacrum

Coccyx

Right and Left Os Coxae

Question 2

The Bones of the pelvic girdle articulate posteriorly with the sacrum at what specific vertebrae?

Answer 2

S1-S3

Question 3

T/F:The subpubic anfle is the distance between ischial tuberosities and is larger in females than males

Answer 3

True

Question 4

Where is the true pelvis found? What is another name for the ture pelvis?

Answer 4

Below the pelvic brim

Pelvis minor

Question 5

What 5 structures help makeup the linea terminalis or Pelvic Brim or Pelvc Inlet?

Answer 5

Pubic Crest

Pecten pubis

Arcuate Line

Margin of sacral ala

Sacral Promonotory

Question 6

What bony structure delineates the lesser sciatic foramen from greater sciatic foramen?

A. Ischial spine

B. Ischial Tuberosity

C. Pectine pubis

D. Ala of the sacrum

Answer 6

Ischial spine

Question 7

The lumbrosacral joint involves the intervertebral disc and 2 zygopophyseal joints between what vertebrae?

Answer 7

L5 and S1

Question 8

What ligament is responsible for stabilizing the L5 vertebrae onto the sacrum by anchoring it’s TP to the iliac crest? What movement does this ligament limit?

A. Anterior and Posterior Saccrococcygeal L.; limits forward movement of L5 vertebrae

B. Arcuate L. and Superior Pubic L.; limits forward movement of L5 vertebrae

C. Iliolumbar L.; limits forward movement of L5 vertebrae

D. Interosseous Sacroilliac, Posterior Sacroiliac, Iliolumbar, Sacrotuberous, Sacrospinous Ls.; limits forward movement of L5 vertebrae

Answer 8

Iliolumbar L.; limits forward movement of L5 vertebrae

Question 9

The Sacrococcygeal joint is between S5 and the coccyx, and it contains an intervertebral disc that allows for posterior movement of the coccyx during childbirth or defecation. What ligament stabilizes the movement of this joint?

A. Anterior and Posterior Saccrococcygeal L

B. Arcuate L. and Superior Pubic L

C. Iliolumbar L.

D. Interosseous Sacroilliac, Posterior Sacroiliac, Iliolumbar, Sacrotuberous, Sacrospinous Ls.

Answer 9

Anterior and Posterior Saccrococcygeal L

Question 10

What ligaments are responsible for stabilizing the pubic symphysis?

A. Anterior and Posterior Saccrococcygeal L

B. Arcuate L. and Superior Pubic L

C. Iliolumbar L.

D. Interosseous Sacroilliac, Posterior Sacroiliac, Iliolumbar, Sacrotuberous, Sacrospinous Ls.

Answer 10

Arcuate L. and Superior Pubic L

Question 11

What 5 ligaments help stabilize the Sacroiliac Joint?

Answer 11

Interosseous Sacroiliac L

Posterior Sacroiliac L

Iliolumbar L

Sacrotuberous L

Sacrospinous L.

Question 12

The lateral wall of the pelvis is formed by what 4 structures?

Answer 12

1. Hip bone below pelvic inlet
2. Obturator internus and covering fascia
3. Sacrotuberous ligament
4. Sacrospinous ligament

Question 13

Which muscle exits the pelvis though the greater sciatic foramen?

A. Piriformis M.

B. Obturator Internus?

Answer 13

Piriformis M.

NOTE: Obterator Internus goes through lesser sciatic foramen

Question 14

Both the obterator Internus and Piriformis Ms. act as lateral thigh rotators, what is another similarity they share?

A. Both originate on S2-S4 lateral masses and sacrotuberous L.

B. Both nerves supplying the muscles originate from S1-S2 level

C. Both nerves supplying the muscles originate from L5-S1

D. Both insert on the greater trochanter

Answer 14

• A. Both originate on S2-S4 lateral masses and sacrotuberous L. - Piriformis M.*
• B. Both nerves supplying the muscles originate from S1-S2 level - Pirformis M.*
• C. Both nerves supplying the muscles originate from L5-S1 - Obterator Internus M.*

D. Both insert on the greater trochanter

Question 15

The pelvic diaphragm forms the floor of the trye plvis and seperates the pelvis from the perineum. What muscles (2) makes up the pelvic diaphragm?

Answer 15

Levator Ani

Coccygeus M.

Question 16

The following muscles make up the Levator Ani muscle. Which of the following is the main part of the muscles that originates on the pubis and inserts on coccyx + anococcygeal L.?

A. Pubococcugeus M.

B. Puborectalis M.

C. Iliococcygeus M.

Answer 16

Pubococcugeus M.

Question 17

The following muscles make up the Levator Ani muscle. Which of the following originates on the pubis and forms a sling with the pubococcygeus M.?

A. Pubococcugeus M.

B. Puborectalis M.

C. Iliococcygeus M.

Answer 17

Puborectalis M.

NOTE: this muscle also increases the angle between the anal canal and rectum to help prevent defecation

Question 18

The following muscles make up the Levator Ani muscle. Which of the following originates on the tendinous arch and ischial spine, and inserts on the coccyx and anococcygeal L.?

A. Pubococcugeus M.

B. Puborectalis M.

C. Iliococcygeus M.

Answer 18

Iliococcygeus M.

Question 19

The Levator Ani muscles receive dual innervation from ______ on the superior pelvic surface, and _______ on the inferior perineal surface.

Answer 19

The Levator Ani muscles receive dual innervation from S3-S4 on the superior pelvic surface, and Inferior Rectal N. on the inferior perineal surface.

Question 20

The pelvic floor is often injured during vaginal childbirth, often injuring what two muscles that act to support the vagina and anal canal?

Answer 20

Pubococcygeus M. and Puborectalis M.

NOTE: the stretching of these structures can result in urinary incontenance, prolapse of pelvic organs, or fecal incontenance

Question 21

T/F: The coccygeus M. forms posteror portion of the diaphragm and originates on ischial spine and sacrospinous L.

Answer 21

True