Gluteal Region And Hip

Question 1

Gluteus maximis

Answer 1

Origin: ilium posterior to posterior gluteal line; dorsal surface of sacrum and coccyx; sacrotuberous ligament
Insertion: most fibers end in iliotibial tract, which inserts into lateral condyle of tibia; some fibers insert on gluteal tuberosity of femur
Action: extends hip joint between flexed and standing positions and assists in its lateral flexion; steadies thigh and assists in rising from sitting position
Innervation: inferior gluteal nerve (L5, S1, S2)

Question 2

Gluteus medius

Answer 2

Origin: external surface of ilium between anterior and posterior gluteal lines
Insertion: lateral surface of greater trochanter of femur
Action: abduct and anterior portions medially rotate hip joint; keep pelvis level when opposite limb is elevated
Innervation: superior gluteal nerve (L4, L5, S1)

Question 3

Gluteus minimus

Answer 3

Origin: external surface of ilium between anterior and inferior gluteal lines
Insertion: anterior surface of greater trochanter of femur
Action: superior gluteal nerve (L4, L5, S1)
Innervation: abduct and anterior portions medially rotate hip joint; keep pelvis level when opposite limb is elevated