Lecture 8: Anatomical Framework of the Pelvis

Question 1

What is the primary joint, and three primary ligaments between the sacrum and ilium?

Answer 1

Joint= Sacroiliac joint
Ligaments= Dorsal sacroiliac ligament, Ventral sacroiliac ligament and interosseous ligament

Question 2

What are the major joint and ligament structures involving the anterior medial section of the pubic bones?

Answer 2

Joint= Pubic symphysis
Ligaments= Superior pubic ligament and inferior (arcuate) pubic ligament

Question 3

What are three key vertebropelvic ligaments? For that 4 or 5, what are the other ones?

Answer 3

Sacrotuberous ligament, sacrospinous ligament, illiolumbar ligament.
Also:
-Anterior longitudinal ligament (connect L5 to the sacrum)
-Obturator membrane
-Inguinal ligament (runs across the anterior superior iliac spine to the pubic tubercle)

Question 4

What is the male and female sub-pubic angle?

Answer 4

can be greater than 80 for females, and roughly 60 for males

Question 5

What are the two main pelvic shapes?

Answer 5

1. Gynecoid

2. Android

Question 6

How big is the suboccipital bregamatic diameter of the fetal head?

Answer 6

8.5-9cm compared to the frontoccipital diameter (10-11cm)

Question 7

What are the main muscles of the pelvic diaphragm?

Answer 7

(ischio)coccygeus and levator ani

Question 8

What are the main component muscles of the levator anI?

Answer 8

1, illiococcygeus

2. Pubococcygeus
3. Puborectalis