Lateral Rotators

Question 1

Piriformis action origin insertion and nerve innervation

Answer 1

A
Laterally rotate the hip (coxal joint)
Abduct the hip when the hip is flexed
O
Anterior surface of sacrum
I
Superior aspect of greater trochanter
N
Sacral plexus L(5), S1, 2

Question 2

Gemellus superior action origin insertion and nerve innervation

Answer 2

A: laterally rotate the coxal joint
O: ischial spine
I: medial surface of greater trochanter
N: sacral plexus

Question 3

Gemellus inferior action origin insertion and nerve innervation

Answer 3

A
Laterally rotate the hip (coxal joint)
O
Ischial tuberosity
I
Medial surface of greater trochanter
N
Sacral plexus L4, 5, S1, (2)

Question 4

Obturator internus action origin insertion and nerve innervation

Answer 4

Obturator Internus
A
Laterally rotate the hip (coxal joint)
O
Obturator membrane and inferior surface of obturator foramen
I
Medial surface of greater trochanter
N
Sacral plexus L5, S1, 2

Question 5

Obturator externus action origin insertion and nerve innervation

Answer 5

Obturator Externus
A
Laterally rotate the hip (coxal joint)
O
Rami of pubis and ischium, obturator membrane
I
Trochanteric fossa of femur
N
Obturator L3, 4

Question 6

Quadratus femoris action origin insertion and nerve innervation

Answer 6

A Laterally rotate the hip (coxal joint)
O
Lateral border of ischial tuberosity
I
Intertrochanteric crest, between the greater and lesser trochanters
N
Sacral plexus L4, 5, S1, (2)