Bony Pelvis Flashcards
What are the three components of the bony pelvis?
Sacrum
Coccyx
Right and Left Os Coxae
The Bones of the pelvic girdle articulate posteriorly with the sacrum at what specific vertebrae?
S1-S3
T/F:The subpubic anfle is the distance between ischial tuberosities and is larger in females than males
True
Where is the true pelvis found? What is another name for the ture pelvis?
Below the pelvic brim
Pelvis minor
What 5 structures help makeup the linea terminalis or Pelvic Brim or Pelvc Inlet?
Pubic Crest
Pecten pubis
Arcuate Line
Margin of sacral ala
Sacral Promonotory
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
Ischial spine
The lumbrosacral joint involves the intervertebral disc and 2 zygopophyseal joints between what vertebrae?
L5 and S1
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
Iliolumbar L.; limits forward movement of L5 vertebrae
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.
Anterior and Posterior Saccrococcygeal L
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.
Arcuate L. and Superior Pubic L
What 5 ligaments help stabilize the Sacroiliac Joint?
Interosseous Sacroiliac L
Posterior Sacroiliac L
Iliolumbar L
Sacrotuberous L
Sacrospinous L.
The lateral wall of the pelvis is formed by what 4 structures?
- Hip bone below pelvic inlet
- Obturator internus and covering fascia
- Sacrotuberous ligament
- Sacrospinous ligament
Which muscle exits the pelvis though the greater sciatic foramen?
A. Piriformis M.
B. Obturator Internus?
Piriformis M.
NOTE: Obterator Internus goes through lesser sciatic foramen
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
- 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
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?
Levator Ani
Coccygeus M.
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.
Pubococcugeus M.
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.
Puborectalis M.
NOTE: this muscle also increases the angle between the anal canal and rectum to help prevent defecation
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.
Iliococcygeus M.
The Levator Ani muscles receive dual innervation from ______ on the superior pelvic surface, and _______ on the inferior perineal surface.
The Levator Ani muscles receive dual innervation from S3-S4 on the superior pelvic surface, and Inferior Rectal N. on the inferior perineal surface.
The pelvic floor is often injured during vaginal childbirth, often injuring what two muscles that act to support the vagina and anal canal?
Pubococcygeus M. and Puborectalis M.
NOTE: the stretching of these structures can result in urinary incontenance, prolapse of pelvic organs, or fecal incontenance
T/F: The coccygeus M. forms posteror portion of the diaphragm and originates on ischial spine and sacrospinous L.
True
