This information has been displayed with the kind permission of SportsInjuryClinic and Get Body Smart who can be found at the links below:

Multifidus

Origin:

Insertion:

Actions:

Innervation:

Daily uses:

Muscles

Other muscles of the Lower Limb

Gluteus Medius

Origin: Outer surface of ilium between the posterior and anterior gluteal lines.

Insertion: Lateral and superior surfaces of the greater trochanter of the femur.

Actions: Abducts thigh at hip; anterior fibres medially rotate thigh and posterior fibres laterally rotate thigh.

Innervation: Superior gluteal nerve (L5, S1)

Daily uses: Stabilising hip through stance phase

Origin: Outer(external) surface of ilium between the anterior and inferior gluteal lines.

Insertion: Anterior surface of the greater trochanter of the femur

Actions: Abducts thigh at hip. Anterior fibres medially rotate hip.

Innervation: Superior gluteal nerve (L5, S1)

Daily uses:

Origin: Ischial tuberosity of os coxae

Insertion: Head of fibula and lateral condyle of tibia

Actions: Flexes leg at knee and laterally rotates lef at knee if the knee is flexed (Also extends thigh at hip) .

Innervation: Tibial part of sciatic nerve (S1-3)

Daily uses: Walking up stairs.