Session 4 - The pelvis Flashcards Preview

Semester 4 - Reproductive System > Session 4 - The pelvis > Flashcards

Flashcards in Session 4 - The pelvis Deck (19)
1

What are the two main muscles of male perineum?

Bulbospongiosus
Ischiocavernosus

2

What does bulbospongiosus do?

Helps to expel last drops of urine and maintain erections

3

What does ischiocavernosus do?

Compresses veins, helping ot maintain erections

4

What are the three parts of the hip bone?

Ilium
Ischium
Pubis

5

What is the pelvic girdle made up of?

Sacrum
Right and left hip bones

6

Where do the hip bones articulate with the sacrum?

Sacroilliac joint

7

Where do the hip bones articulate with each other?

Pubic symphyy

8

What is a gynecoid pelvis?

o Round inlet
o Straight side walls
o Ischial spines not too prominent
o Well-rounded greater sciatic notch
o Well-curved sacrum (to fit with foetal head)
o Sub-pubic arch > 900

9

Give five differences between male and female pelvi

General structure
- Male thick and heavy
- Female - Thin and light
Pubic arch and subpubic angle
- Male - Narrow (80)
Obturator foramen
- Male, round
- Female, oval
Acetabulum
- Male - large
Female - Small
Greater sciatic notch
- Male - Narrow
- Female - > 90*

10

What is the pelvic inlet formed by?

o Promontory and ala of the sacrum posteriorly
 Superior surface of its lateral part, adjacent to the body of the sacrum
o Right and left linea terminalis anteriorly
 Arcuate line on the inner surface of the ilium
 Pectineal line and pubic crest

11

What are three measurements which must be made in a clinical assesment of the pelvic inlet?

Anatomic conjugate
Obstetric conjugate
Diagonal conjugate

12

What is the anatomic conjugate?

 Measured from the sacral promontory to the superior border of the pubic symphysis

13

What is the obstetric conjugate?

 Measured from sacral promontory to the midpoint of the pubic symphysis.
 Minimum diameter of the canal, as this is where the pubic bone is the thickest

14

What is the diagonal conjugate?

 Measured from sacral promontory to the inferior border of the pubic symphysis

15

What is the pelvic outlet formed by?

o Pubic arch anteriorly
o Ischial tuberosities laterally
o Inferior margin of the sacrotuberous ligament posterolaterally
o Sacrospinous ligament also present
o Tip of the coccyx posteriorly

16

What is the pelvic inlet made up of posteriorly?

Sacrotuberous ligament

17

What happens to the sacrotuberous ligament during child birth?

Progesterone works to soften the ligament to increase the size of the pelvic outlet to aid childbirth

18

What is the greater pelvis bounded by?

o Superior to the pelvic inlet
o Bounded by the iliac alae posterolaterally
o Bounded by the anterosuperior aspect of the S1 vertebra posteriorly
o Occupied by abdominal viscera (E.g. the ileum and sigmoid colon)

19

What is the lesser pelvis bounded by?

o The bony canal, which is solid and immovable, between the pelvic inlet and outlet
o Bounded by the pelvic surfaces of the hip bones, sacrum and coccyx
The lesser pelvis is of major obstetrical and gynaecological significance.