Pelvic Wall

Question 1

Acetabulum

Answer 1

Fusion of Ishium, Pubis, and Ilium. Socket for femur insertion

Question 2

Sacrotuberous ligament

Answer 2

Connects Ischial tuberosity to sacrum, wall of lesser siatic foramen

Question 3

Sacrospinous ligament

Answer 3

Connects Ischial spine to sacrum, border of greater siatic foramen

Question 4

Sacroischial joint

Answer 4

Anterior part synovial, posterior part syndesmosis (fiborous/ligamentous)

Question 5

Greater sciatic formen

Answer 5

Exit from pelvis to gluteal region

Question 6

Lesser sciatic foramen

Answer 6

Entrance from gluteal retion to perineum

Question 7

Ligament spreventing sacrum rotation

Answer 7

Anterior sacroiliac ligaments, posterior sacroiliac ligaments, sacrospinous ligament, sacrotuberous ligament (especially last two probably)

Question 8

Openings to pelvis from lowar limb

Answer 8

Subinguinal (anterior thigh), Obturator canal (medial thigh), Greater sciatic formen (gluteal region, exit), Lesser sciatic forament (gluteal region, entrance)

Question 9

Pelvic Inlet borders:

Answer 9

promotory and ala of sacrum, pubic crest+pectineal line+arcuate line=left and right linea terminalis (also this is the pelvic brim)

Question 10

Pelvic outlet borders:

Answer 10

Pubic arch (ant), ischial tuberosities (laterally), inferior margin of sacrotuberous ligament(laterally), Tip of coccyx (posterior)

Question 11

Anatomical position of pelvis

Answer 11

ASIS and anterior aspect of pubic symphysis lie in same plane

Question 12

Greater pelvis

Answer 12

False pelvis: sup to pelvic inlet, bounded by iliac alae posteriorlaterally and anterosuperior aspect of S1 posteriorly. contains abdominal visceral

Question 13

Lesser Pelvis

Answer 13

True Pelvis: Between the pelvic inlet and pelvic outlet; b/w pelvic surfaces of hip bones, sacrum, and coccyx; contains pelvic visceral

Question 14

Female Pelvis as compared to male

Answer 14

Pelvic inlet: oval (left to right) vs bean shaped
Pelvic outlet: circular & wider & broader vs oval & skiny (anterior to posterior)
Pelvic cavity: cylindrical vs inverse pyramidal
pubic arch: obtuse vs acute angle

Question 15

Diameters of pelvis

Answer 15

Transverse, oblique, conjugate (AP) and cojugate diagonal (really the only one easily measured clinically), Interspinous diameter (just above pelvic outlet, narrowest diamter)

Question 16

Pelvic wall muscles

Answer 16

Piriformis, Obturator internus

Question 17

Piriformis

Answer 17

part of pelvic wall. Blood: Superior and inferor gluteal arteries, internal pudendal artery
Innervation: ventral rami of S1 and S2
Action: Laterally rotate thight, abduct flexed thigh

Question 18

Obturator internis

Answer 18

part of pelvic wall
Blood: Internal oudendal and superior gluteal arteries
Action: laterally rotate thigh, abduct flexed thigh
Innervation: nerve to obturator internus (L5-S2)

Question 19

Pelvic floor muscles

Answer 19

Coccygeus, Levator ani (3 parts: pubococcygeus, iliococcygeus, puborectalis)

Question 20

Coccygeus

Answer 20

Part of pelvic floor
Blood: inferior gluteal artery
Acton: supports pelvic viscera, draws coccyx forward
Innervation: ventral rami S4-S5

Question 21

Levator ani

Answer 21

3 Parts: pubococcygeus, iliococcygeus, puborectalis (part of pubococcygeus, u-shaped, maintains fecal continence)
Blood: infereror gluteal artery, internal pudendal artery and branches, inferior rectal and perineal arteries
Action: support pelvic viscera, raise pelvic floor
Innervation: ventral rami of S3-S4 (autonomic), Perineal nerve (somatic)

Question 22

Pelvic diaphram

Answer 22

Levator ani (pubococcygeus and iliococcygeus) and coccygeus muscles