Which three actions are shared by the iliacus and psoas major muscles?

The iliacus and psoas major muscles, collectively known as the iliopsoas, are primarily responsible for hip flexion. This means they play a key role in bringing the thigh towards the abdomen, which is essential for movements such as walking, running, and climbing stairs. Additionally, both muscles contribute to ADduction of the hip to some extent, particularly when the hip is flexed, as this positioning allows for finer adjustments of the leg's position.

These muscles also assist in lateral rotation of the hip when the leg is flexed. This tertiary action is useful in certain movements, providing the ability to pivot or rotate the thigh. Therefore, the correct actions shared by the iliacus and psoas major are flexion, ADduction, and lateral rotation, emphasizing their crucial role in hip movement mechanics during various activities.