Term
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Definition
Origin- Anterior surface of sacrum and sacrotubrous ligament.
Insertion- Superior Border of greater trochanter of femur
Innervation- Ventral Rami of S1 and S2
Action- Lateral rotation of extended thigh, abduction of flexed thigh, steadies femoral head in acetabulum |
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Term
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Definition
Origin- Ischial Spine
Insertion- Medial surface of greater trochanter of femur
Innervation- ventral rami S1 and S2
Action- Lateral rotation of extended thigh, abduction of flexed thigh, steadies femoral head in acetabulum (same as piriformis) |
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Term
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Definition
Origin- Ischial tuberosity
Insertion- Medial Surface of greater trochanter
Innervation- ventral rami of S1 and S2
Action- lateral rotation of extended thigh, abduction of flexed thigh, steadies femural head in acetabulum (same as piriformis) |
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Term
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Definition
Origin- Pelvis surface of obturator membrane and surrounding bones.
Insertion- Medial surface to greater trochanter of femur
Innervation- Nerve to obturator internus (L5, S1)
Action- Lateral rotation of extended thigh, abduction of flexed thigh, steadies femur head in acetabulum. (same as piriformis) |
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Term
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Definition
Origin- Outer surface of obturator membrane and outer surface of the bony margin of the obturator foramen.
Insertion- Trochanteric Fossa
Innervation- Obturator nerve (posterior division)
Action- Laterally rotate thigh, steadies head of femur in acetabulum |
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Term
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Definition
Origin- Lateral border of the ischial tuberosity
Insertion- Quadrate tubercle and the area below it.
Innervation- Nerve to quadratus femoris (L5, S1)
Action- Laterally rotate thigh (stongest), steadies femoral head in acetabulum |
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Term
| visible only during dissection |
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Definition
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Term
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Definition
| Superior Gamellus, Obturator Internus, Inferior Gamellus |
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Term
| What is the key muscle in understanding the arrangement of structures in the Gluteal Region? |
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Definition
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Term
| What structures pass above the piriformis? (3) |
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Definition
| Superior gluteal nerve, artery, and vein. |
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Term
| What structures pass below the piriformis? |
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Definition
Internal Pudendal vessels
Pudendal nerve
Posterior Cutaneous nerve of thigh
Inferior Gluteal nerve and vessels
Sciatic nerve
Nerve to quadratus femoris
Nerve to obturator internus |
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