Origin:

• pubis bone

Insertion:

• Unites with opposite puborectalis to form a muscluar sling

Nerve: sacral nerve

Action:

• supports the pelvic viscera, raises the pelvic floor for coughing, vomiting, urinating and defecating

Origin:

• pubis bone

Insertion:

• coccyx

Nerve: sacral nerve

Action:

• supports the pelvic viscera, raises the pelvic floor for coughing, vomiting, urinating and defecating

Comments:

• Main part of the levator ani

Origin:

• obturator foramen, membrane and the ischial spine

Insertion:

• coccyx

Nerve: sacral nerve

Action:

• supports the pelvic viscera, raises the pelvic floor for coughing, vomiting, urinating and defecating

Origin:

• ischial spine

Insertion:

• coccyx

Nerve: sacral nerve

Action:

Comments:

• forms the posterior part of the pelvic floor

Origin:

• ilium (and iliac crest) posterior to posterior gluteal line

• posterior sacrum & coccyx

• sacrotuberous ligament

• posterior sacroiliac ligaments

Insertion:

• gluteal tuberosity (30%)

• iliotibial tract (70%)

– Iliotibial tract inserts onto lateral condyle of tibia

Nerve: inferior gluteal nerve

Action(s):

• extension

• lateral rotation

Comments:

largest and most superficial gluteal muscle

Origin:

• external surface of ilium between anterior

and posterior gluteal lines

Insertion:

• greater trochanter (lateral surface)

Nerve: superior gluteal nerve

Action(s):

• abduction

• medial rotation

Origin:

• external surface of ilium between the anterior and inferior gluteal lines

Insertion:

• greater trochanter (anterior surface)

Nerve: superior gluteal nerve

Action(s):

• abduction

• medial rotation

Comments:

• lies deep to gluteus medius

• during gait, its actions are similar to that of gluteus medius

Origin:

• anterior surface of sacrum and sacrotuberous ligament

Insertion:

• greater trochanter (superior border)

Nerve: ventral rami of S1 – S2

Action:

• laterally rotates extended thigh

• abducts flexed thigh

Origin:

• Pelvic (posterior) surface of obturator

membrane and surrounding bones

Insertion:

• greater trochanter (medial surface)

Nerve: nerve to obterator internus (L5-S1)

Action:

• lateral rotation of extended thigh

• abduction of flexed thigh

Comments:

• Leaves the pelvis through the lesser sciatic foramen

• Is assisted by the gemelli muscles

Origin:

• ischial spine

Insertion:

• greater trochanter (medial surface)

Nerve: nerve to obterator internus (L5-S1)

Action:

• lateral rotation of extended thigh

• abduction of flexed thigh

Origin:

• Ischial tuberosity

Insertion:

• greater trochanter (medial surface)

Nerve:

nerve to quadratus femoris

Action:

• laterally rotates extended thigh

• abducts flexed thigh

Origin:

• lateral border of ischial tuberosity

Insertion:

• intertrochanteric crest

Nerve:

nerve to quadratus femoris

Action:

• laterally rotates thigh

Comments:

• Short, flat, rectangular-shaped muscle

Origin:

• ASIS

• anterior part of iliac crest

– On the ilac ala side

Insertion:

• Iliotibial tract (which attaches to the

lateral condyle of the tibia)

Nerve: superior gluteal nerve

Action:

• abducts, flexes and medially rotates the hip

• helps stabilize the pelvis during standing

Comments:

• When the iliopsoas is paralyzed, TFL undergoes hypertrophy in an attempt to compensate