Buttocks Flashcards
Tensor Fascia Latae origin
Anterolateral superior iliac spine
Tensor Fascia Latae insertion
Iliotibial band (and thus Gerdys tubercle)
Tensor Fascia Latae action
Assist flexion, abduction, and internal rotation of the thigh, tense fascia lata
Tensor Fascia Latae innervation and spinal level
Superior gluteal (L4-S1)
Gluteus Maximus origin
Posterlateral sacrum, gluteal surface of posterior ilium, thoracolumbar fascia, and sarotuberous ligament
Gluteus Maximus insertion
Iliotibial band and gluteal tuberosity
Gluteus Maximus action
Extension, external rotation
Also:
upper fibers- abduction
Lower fibers- assist adduction at hip
Gluteus Maximus innervation and spinal level
Inferior gluteal L5-S2
Gluteus medius origin
Upper/ outer surface of the ilium
Gluteus medius insertion
Greater trochanter (lateral surface)
Gluteus medius action
Abduct thigh
In addition:
anterior part-assist in internal rotation;may assist flexion of thigh
Posterior part- assists external rotation and extension of thigh
Gluteus medius innervation and spinal level
Superior gluteal L4-S1
Gluteus minimus origin
Outer middle surface of the ilium
Gluteus minimus insertion
Greater trochanter (anterolateral surface)
Gluteus minimus action
Abduct thigh
In addition:
Anterior part- assist internal rotation; may assist flexion of thigh
Posterior part- assist external rotation and extension of thigh
Gluteus minimus innervation and spinal level
Superior gluteal L4-S1)
Piriformis origin
Anterolateral (pelvic) surface of the sacrum
Piriformis insertion
Great trochanter (apex)
Piriformis action
External rotate thigh (in neutral); abduct thigh when at least slightly flexed (= horizontal abduction), extend hip, IR (when hip flexed past 60)
Piriformis innervation and spinal level
Nerve to piriformis S1-2
Obturator internus origin
Internal (pelvic) side of obturator foremen and membrane
Obturator internus insertion
Greater trochanter (medial surface)
Obturator internus action
External rotation of thigh, adduction, extension, (can help abduction depending on hips position)
Obturator internus innervation and spinal level
Nerve to obturator internus L5-S1
Superior gemellus origin
Ischial spine
Superior gemellus insertion
Greater trochanter (via obturator internus tendon)
Superior gemellus action
External rotation of thigh, adduction, extension, (can help abduction depending on hips position)
Superior gemellus innervation and spinal level
Nerve to gemellus superior L5-S1
Inferior gemellus origin
Ischial tuberosity
Inferior gemellus insertion
Greater trochanter (via obturator internus tendon)
Inferior gemellus action
External rotation of thigh, adduction, extension, (can help abduction depending on hips position)
Inferior gemellus innervation and spinal level
Nerve to gemellus inferior L5-S1
Quadratus femoris origin
Ischial tuberosity (lateral border)
Quadratus femoris insertion
Intertrochanteric crest (quadrate tubercle), lesser trochanter
Quadratus femoris action
External rotation and adduction of thigh
Quadratus femoris innervation and spinal level
Nerve to quadratus femoris L5-S1
Obturator externus origin
Outer (external) margin of obturator foremen and membrane
Obturator externus insertion
Trochanteric fossa
Obturator externus action
External rotation; adduction of thigh
Obturator externus innervation and spinal level
Branch of obturator L3-4
