Lecture 25: Pelvis

Question 0

What bones make up the pelvic girdle?

Slide 7 and 8 for image. Learn the bones

Answer 0

H

Question 1

What is the pelvis?
What’s does it do?
Greater pelvis? (False)
Lesser pelvis? (True)

Answer 1

Space enclosed by pelvic girdle.
• Pelvic girdle (coxal bones + sacrum) connects
vertebral column to two femurs.
• Greater (false) pelvis = inferior abdominal cavity; superior to pelvic inlet.
• Lesser (true) pelvis = inferior to pelvic brim. ➡ Bears weight of upper body;
➡ provides attachment for locomotor muscles;  contains/protects pelvic viscera;
➡attachment for muscles/membranes/erectile bodies
Check out slide 4

Question 2

Pelvic inlet has 3 diameters. What are they?

And tell me what makes up the pelvic outlet?

Answer 2

• Conjugate (true, fixed) diameter
• Transverse diameter
• Oblique diameter

Pelvic outlet?
The pelvic outlet (inferior pelvic aperture) is bounded by:
• Pubic arch anteriorly.
• Ischial tuberosities laterally.
• Inferior margin of the sacrotuberous ligament (running between the coccyx and the ischial tuberosity) posterolaterally.
• Tip of the coccyx posteriorly.

Question 3

What muscles make up the pelvic diaphragm?

What is the function of the pelvic diaphragm?

Answer 3

Coccygeus
• Iliococcygeus
• Pubococcygeus
• Puborectalis 
Last 3 are levator ani muscles 

Function? Don’t know

Question 4

What is the function of this passage between the piriformis and coccygeus muscle?

Answer 4

Don’t know

Question 5

The piriformis muscle
Slide 37
What’s its origin, insertion, actions?

Answer 5

Origin: anterior surface of sacrum

Insertion: greater trochanter of the femur

Actions: laterally rotates the thigh at the hip joint. If thigh is first flexed approx. >60 degrees, piriformis becomes an abductor and medial rotator of the thigh at the hip joint.

Question 6

Print every slide of and learn the shit out of them

Answer 6

Yee