Question

What are the quadriceps femoris (quad) muscles innervated by? What is their action?

a) Innervated by the femoral nerve and responsible for flexing the hip.
b) Innervated by the sciatic nerve and responsible for extending the hip.
c) Innervated by the femoral nerve and responsible for extending the knee.
d) Innervated by the obturator nerve and responsible for flexing the knee.

Answer 1

The quadriceps femoris muscles are innervated by the femoral nerve and are responsible for extending the knee.

Step-by-step explanation:

The quadriceps femoris, often referred to simply as the quadriceps, is a group of four muscles located at the front of the thigh. These muscles work together to extend the knee joint and play a crucial role in activities such as walking, running, jumping, and standing up from a seated position. The quadriceps femoris is one of the major muscle groups in the body, and it is important for overall lower limb strength and function.

The quadriceps femoris muscles are innervated by the femoral nerve and are responsible for extending the knee.

The quadriceps femoris group consists of four muscles: the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius.

When these muscles contract, they extend the knee joint, helping to straighten the leg.