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Muscles of the Gluteal region
O, I, Inn, action
9
Anatomy
Graduate
10/27/2017

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Term
Gluteus Maximus
Definition
O: Ilium behind posterior gluteal line; adjacent sacrum and coccyx; and sacrotuberous ligament
I: Iliotibal tract (band) and gluteal tuberosity
Inn: Inf. Gluteal Nerve
Action: extends, assists in adduction and lateral rotation of thigh at hip joint; extends trunk; also abduction (upper fibers)
Term
Gluteus Medius
Definition
O: Ilium, area between iliac crest, posterior gluteal line and anterior gluteal line.
I: Lateral surface of greater trochanter
Inn: Sup. Gluteal Nerve
Action: Abducts thigh, functions during walking to stabilize pelvis' medial fibers assist extension; lateral fibers assist in medial rotation
Term
Gluteus Minimus
Definition
O: Ilium between anterior and inferior gluteal lines
I: anterior border of greater trochanter
Inn: Superior Gluteal Nerve
Action: Abducts thigh, function during walking to stabilize pelvis; medial fibers assist extension; lateral fibers assist in medial rotation
Term
Tensor Fascia Latae
Definition
O: Iliac crest and anterior border of ilium
I: Iliotibial tract (IT band)
Inn: Superior Gluteal Nerve
Action: Flexor of thigh with some medial rotation during flexion
Term
Piriformis
Definition
O: Anterior surface of 2nd, 3rd, and 4th sacral vertebrae
I: Upper border of greater trochanter
Inn: Nerves from S1 and S2 within pelvis
Action: Lateral rotation, slight extension and abduction during rotation
Term
Superior Gemellus
Definition
O: Ischial Spine
I: Upper border of greater trochanter
Inn: Nerve to obturator internus, and sup. Gemellus
Action: Lateral rotation
Term
Inferior Gemellus
Definition
O: Ischial Tuberosity
I: Upper border of greater trochanter
Inn: Nerve to Quadratus Femoris and Inf. Gemellus
Action: Lateral Rotation
Term
Obturator Internus
Definition
O: Margins of obturator foramen and membrane
I: Upper Border of greater trochanter
Inn: Nerve to obturator internus
Action: Lateral Rotation
Term
Quadratus Femorus
Definition
O: Ischial Tuberosity
I: Quadrate Tubercle
Inn: Nerve to quadatus femoris
Action: Lateral rotation, some adduction
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