Which are actions of the psoas major?
A)extension of the thigh at the hip joint and posterior tilt of the pelvis at the hip joint
B)flexion of the thigh at the hip joint and anterior tilt of the pelvis at the hip joint
C)lateral rotation and medial rotation of the thigh at the hip joint
D)lateral flexion of the trunk at the spinal joints and lateral rotation of the leg at the knee joint

Question

Quizplus · Accepted Answer

The psoas major muscle is a hip flexor and contributes to the anterior tilt of the pelvis during hip flexion. It also assists in lateral rotation of the thigh at the hip joint. Therefore, option B (flexion of the thigh at the hip joint and anterior tilt of the pelvis at the hip joint) is the correct answer. Option A is incorrect because the psoas major does not extend the thigh or posteriorly tilt the pelvis. Option C is incorrect because the muscle contributes to lateral rotation, but not medial rotation. Option D is incorrect because the psoas major does not laterally flex the trunk, and it does not rotate the leg at the knee joint.

Which Are Actions of the Psoas Major