Updated: 10/19/2017

Piriformis

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https://upload.orthobullets.com/topic/10073/images/obturator-internus.jpg

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





 
 

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Questions (2)

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(OBQ11.258) Which of the following muscles originates from the ventral surface of the sacrum? Review Topic | Tested Concept

QID: 3681
1

Obturator internus

16%

(570/3588)

2

Obturator externus

5%

(171/3588)

3

Quadratus femoris

5%

(162/3588)

4

Piriformis

72%

(2589/3588)

5

Superior gemellus

2%

(79/3588)

L 3 C

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(OBQ07.16) The inferior and superior gluteal nerves are designated as such based on their relationship to what structure? Review Topic | Tested Concept

QID: 677
1

The gluteus maximus

3%

(107/3583)

2

The gluteus minimus

4%

(142/3583)

3

The piriformis muscle

77%

(2765/3583)

4

The sciatic nerve

2%

(88/3583)

5

The sacrospinous ligament

13%

(455/3583)

L 2 C

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Evidences (3)
Topic COMMENTS (3)
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