PHTY100 Lecture Notes - Lecture 2: Greater Sciatic Foramen, Lesser Sciatic Foramen, Pelvic Brim
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3. 12 identify, describe the attachments of and deduce the actions of the iliopsoas muscle (comprising psoas major and iliacus). Iliacus: this is a large fleshy triangular muscle situated mainly in the pelvis, the upper attachment is the iliac fossa, the lower insertion if the lesser trochanter of the femur, the actions are similar to the psoas major. Its fibres pass downwards and forwards and medially, blending with the lateral side of the psoas major. If the upper attachment is the fixed point, and pulls the thigh forward in hip flexion. If the lower attachment is the fixed point, it draws the pelvis forward, flexing the hip (however with the trunk moving instead of the hip) 3. 13 identify, describe the attachments and deduce the actions of: Piriformis: this is located posterior to the hip joint, the upper attachment is the sacral segments of the.
