Flashcards in M:Gluteal region and hip joint Deck (45)
How do gluteus medius and minimise stabilize the lower limbs when walking?
when standing on the right leg, right gluteus medius and minimus contract and prevent the pelvis sagging on the left
What are the attachments of the piriformis muscle?
Proximal - anterior sacrum
Distal - medial side of superior border of greater trochanter of femur
How does piriformis exit the pelvis to reach the gluteal region?
Passes laterally and inferiorly through the greater sciatic foramen to get out of the pelvis
Where does the sciatic nerve emerge in the gluteal region?
Lower border of piriformis
Where is a safe area to perform intramuscular injections in the gluteal region?
Upper, outer quadrant of either gluteal region
Which 3 vessels/nerves pass through the greater sciatic foramen superior to piriformis?
1) Superior gluteal nerve
2) Superior gluteal artery and veins
Which 10 vessels/nerves pass through the greater sciatic foramen inferior to the piriformis muscle?
1) Pudendal nerve
2) Internal pudendal artery and vein
3) Inferior gluteal nerve
4) Inferior gluteal artery and vein
5) Sciatic nerve
6) Posterior cutaneous nerve of thigh
7) Nerve to quadratus femoris
8) Nerve to obturator internus
Which structures pass through the lesser sciatic foramen?
1) Pudendal nerve, artery and vein (to enter perineum)
2) Tendon of obturator internus
What are the attachments of obtruator internus?
Proximal - anterolateral wall of true pelvis, deep surface of obturator membrane and surrounding bone
Distal - medial side of greater trochanter of femur
What 4 muscles are found in very close proximity to the sciatic nerve?
1) Obturator internus
2) Superior and inferior gemelli
3) Quadratus femoris
What are the attachments of superior gemellus?
Proximal - external surface of ischial spine
Distal - along length of superior surface of tendon of obturator internus and into medial greater trochanter of femur with it
What are the attachments of inferior gemellus?
Proximal - upper aspect of ischial tuberosity
Distal - along inferior length of tendon of obturator internus and into medial greater trochanter of femur with it
What is the common distal attachment of piriformis, obturator internus and the gemelli?
Medial side of greater trochanter of the femur
What are the 2 common actions of the piriformis, obturator internus and the gemelli?
1) Laterally rotates extended femur at the hip joint
2) Abducts flexed femur at the hip joint