Flashcards in Lecture 25: Pelvis Deck (7)
What is the pelvis?
What's does it do?
Greater pelvis? (False)
Lesser pelvis? (True)
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
What bones make up the pelvic girdle?
Slide 7 and 8 for image. Learn the bones
Pelvic inlet has 3 diameters. What are they?
And tell me what makes up the pelvic outlet?
-Conjugate (true, fixed) diameter
* Transverse diameter
* Oblique diameter
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.
What muscles make up the pelvic diaphragm?
What is the function of the pelvic diaphragm?
Last 3 are levator ani muscles
Function? Don't know
What is the function of this passage between the piriformis and coccygeus muscle?
The piriformis muscle
What's its origin, insertion, actions?
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.