Questions: The prime mover of hip extension is the pectineus gluteus maximus gracilis adductor magnus

The answer is the second one: gluteus maximus.

Explanation for each option:

• Pectineus: This muscle is primarily involved in hip flexion and adduction, not extension. Therefore, it is incorrect.
• Gluteus maximus: This is the primary muscle responsible for hip extension. It is the largest and most superficial of the gluteal muscles, making it the correct answer.
• Gracilis: This muscle is involved in hip adduction and knee flexion, not hip extension. Therefore, it is incorrect.
• Adductor magnus: This muscle primarily functions in hip adduction and also assists in hip flexion and extension, but it is not the prime mover for hip extension. Therefore, it is incorrect.

In summary, the gluteus maximus is the primary muscle responsible for hip extension.