LE--Deep Six External Rotators of the Hip

Piriformis Origin

Anterior surface of the sacrum

Piriformis Insertion

Greater trochanter (through greater sciatic foramen)

Piriformis Action

1. Hip external rotation

2. Hip abduction

3. Hip internal rotation with hip flexed above 90 degrees

Piriformis Innervation

Nerve to piriformis

Gemellus Superior Origin

Ischial spine

Gemellus Superior Insertion

Greater trochanter via tendon of obturator internus

Gemellus Superior Action

Hip external rotation

Gemellus Superior Innervation

Nerve to obturator internus

Obturator Internus Origin

Internal surface of obturator foramen and membrane

Obturator Internus Insertion

Greater trochanter

Obturator Internus Action

Hip external rotation

Obturator Internus Innervation

Nerve to obturator internus

Gemellus Inferior Origin

Ischial tuberosity

Gemellus Inferior Insertion

Greater trochanter via tendon of obturator internus

Gemellus Inferior Action

Hip external rotation

Gemellus Inferior Innervation

Nerve to quadratus femoris

Obturator Externus Origin

1. Pubis and ischium near obturator foramen

2. External surface of obturator membrane

Obturator Externus Insertion

Trochanteric fossa

Obturator Externus Action

Hip external rotation

Obturator Externus Innervation

Obturator

Quadratus Femoris Origin

Ischial tuberosity

Quadratus Femoris Insertion

Quadrate tubercle

Quadratus Femoris Action

1. Hip external rotation

2. Hip adduction

Quadratus Femoris Innervation

Nerve to quadratus femoris