Hip lateral rotators

(also gluteus maximus)

What is the origin of the Piriformis?

Front of the 2nd and 4th sacral segments, gluteal surface of the ilium of the innominate bone and sacrotuberous ligament.

What is the insertion of the Piriformis

Upper border and medial side of greater trochanter of femur

What is the nerve supply of the Piriformis?

Anterior rami of the sacral plexus L5, S1, 2

What is the action/function of the Piriformis?

Lateral rotation of hip and abduction when subject is in a sitting position

What is the origin of obturator internus?

Internal surface of obturator membrane and surrounding bony margin of innominate bone

What is the insertion of the Obturator internus?

Medial surface of the greater trochanter of the femur

What is the nerve supply of the Obturator internus?

Nerve to obturator internus L5, S1, 2

What is the action/function of the Obturator internus?

Lateral rotation of the hipadn abduction when subject is in a sitting position

What is the origin of the gemellus superior?

Gluteal surface of ischial spine of innominate bone

What is the insertion of the Gemellus superior?

Medial surface of greater trochanter to femur

What is the nerve supply for the Gemellus superior

Nerve to obturator internus L5, S1, 2

What is the function/action of the Gemellus superior?

Lateral rotation of the hip and abduction when subject is in a sitting position

What is the origin of the Gemellus inferior?

Upper part of ischial tuberosityof innominate bone

What is the insertion of the Gemellus inferior?

Blends with obturator internus and attaches to medial surface of greater trochanter of femur

What is the nerve supply for the Gemellus inferior?

Nerve to Quadratus Femoris L4, 5, S1

What is the action/ function of the Gemellus inferior

Lateral rotation of hip and abduction when subject is in a sitting position

What is the origin of the Quadratus femoris?

Lateral border of ischial tuberosity

What is the insertion of the Quadratus femoris?

Quadrate tubercle on the intertrochanteric crest femur

What is the nerve supply for the Quadratus femoris?

Nerve to quadrates femoris L4, 5, S1

What is the action/function of the Quadratus femoris?

Laterally rotates the hip and stabilises the femoral head

What is the origin of the Obturator externs?

External surface of the obturator membrane and surrounding bony margins of the obturator foramen

What is the insertion of the Obturator externs?

Trochanteric fossa of femur

What is the nerve supply for the Obturator Externus?

Obturator nerve, posterior division L3, 4

What is the action/function of the Obturator externus?

Lateral rotation of hip and stabilises the femoral head