Final answer:
Assuming a typo of 'lilacs' for 'iliac', the thigh does not move as iliac muscles do not control thigh movement. If 'psoas' was intended, thigh flexion occurs upon contraction.
Step-by-step explanation:
It seems there might be some confusion in your statement, and I'll address both possibilities.
If you are referring to the iliac muscles, which are generally part of the iliotibial (IT) band and not directly involved in thigh movements, there wouldn't be a significant effect on the thigh's motion during contraction.
However, if the intended term is "iliopsoas," a combination of the psoas major and iliacus muscles, then contraction of this muscle does indeed result in thigh flexion. The iliopsoas is a powerful hip flexor that connects the lumbar spine and the pelvis to the femur. When it contracts, it pulls the thigh upward toward the abdomen. This action is crucial for various movements, including walking, running, and activities that involve bending at the waist.
It's important to consider the specific muscle or muscle group involved, as the body's anatomy is complex, and different muscles contribute to various movements. Additionally, the impact of muscle contraction can vary based on factors such as body position and the specific action being performed.