Pelvic Walls and Floor Flashcards
What bones make up the pelvis
Sacrum (x1)
Innominate or hip bone (x2)
What is the hole in the inferior section of the pelvis called
Obturator foramen
What part of the pelvis do we sit on
Ischial tuberosity
Name the 3 main joints throughout the pelvis; and what type of joint are they
- Lumbosacral joint (secondary cartilaginous)
- Sacroiliac joint (synovial plane)
- Pubic symphysis (secondary cartilaginous)
What structures make up the anterior wall of the pelvis
Pubic bodies, pubic rami and pubic symphysis
What structures make up the posterior wall of the pelvis
Sacrum, coccyx and piriformis
Describe the floor of the pelvis
The floor is muscular and composes the pelvic diaphragm
Name the 4 ligaments within the pelvis
- Posterior sacroiliac (fibrous)
- Anterior sacroiliac (synovial)
- Sacrospinous
- Sacrotubercle
Name the common pelvic outlets in males and females
Male = Android Female = Gynecoid
Where does the iliacus muscle travel from and to
Iliac fossa, joins the psoas muscle (forming the iliopsoas) and inserts into the lesser trochanter of the femur
What nerve innervates the iliacus muscle
Femoral
What is the function of the iliacus muscle
Hip flexion
Where does the psoas muscle travel from and to
T12-L4 bodies and IV discs (superficial) and L1-L5 (deep), joins the iliacus (forming the iliopsoas) and inserts into the lesser trochanter of the femur
What is the function of the psoas muscle
Hip flexion, bend trunk laterally (one) and raise trunk from supine position (both)
What is the root value of the psoas muscle
Lumbar plexus direct branches L2-L4 anterior rami
Where does the obturator externus muscle pass from and to
Outer surface of the obturator membrane to the trochanteric fossa of femur
Where does the obturator internus muscle pass from and to
Inner surface of the obturator membrane to medial surface of greater trochanter of femur
What is the function of the obturator internus
Lateral rotation of the hip
What is the innervation of the obturator internus
Nerve to obturator internus direct from sacral plexus (L5, S1)
Where does the piriformis muscle pass from and to
Pelvic surface of the sacrum to the greater trochanter of the femur
What is the function of the piriformis
Lateral rotation of the hip joint
What nerve innervates the piriformis
Nerve to piriformis (S1, S2)
What structures pass through the obturator foramen
- Obturator artery
- Obturator vein
- Obturator nerve
What does the pelvic diaphragm prevent
It prevents any prolapse of structures within the pelvic cavity