Origin Anterior surface of lateral process of sacrum and gluteal surface of ilium at the margin of the greater sciatic notch Insertion Superior border of greater trochanter Action Lateral rotator of the hip joint; also helps abduct the hip if it is flexed Innervation Piriformis nerve (L5, S1, S2) (L5, S1, S2) Arterial Supply Superior and inferior gluteal and internal pudendal arteries
QUESTIONS 1 of 2 1 2 Previous Next (OBQ07.16) The inferior and superior gluteal nerves are designated as such based on their relationship to what structure? Review Topic QID: 677 1 The gluteus maximus 3% (68/2435) 2 The gluteus minimus 4% (104/2435) 3 The piriformis muscle 74% (1810/2435) 4 The sciatic nerve 3% (75/2435) 5 The sacrospinous ligament 15% (357/2435) ML 2 Select Answer to see Preferred Response PREFERRED RESPONSE 3 (OBQ11.258) Which of the following muscles originates from the ventral surface of the sacrum? Review Topic QID: 3681 1 Obturator internus 17% (433/2492) 2 Obturator externus 5% (127/2492) 3 Quadratus femoris 5% (114/2492) 4 Piriformis 70% (1745/2492) 5 Superior gemellus 2% (61/2492) ML 3 Select Answer to see Preferred Response PREFERRED RESPONSE 4