Question

Structural Mechanical & Kinesiology

Analysis of the following muscles- rectus femoris, vastus intermedius, vastus lateralis, vastus medialis in relation to the listed questions(if no possible answer provide NA).

·        What is the muscle’s performance potential on the . . .?

·        What stabilization function does this muscle perform . . .?

·        State and explain this muscle’s performance potential . . . .

·        Plane of motion and axis involved with this muscle’s contraction?

·        What positions of the crossed joints will cause this muscle to be most stretched? Most contracted?

·        At this joint, what lever exists and what is it optimized for (show lever components on picture)?

·        Purest Action?

·        State a synergist muscle and its synergistic function to one of the Action(s)

·        What is the functional benefit of this muscle’s shape and construction?

·        Provide two neutralizing synergists for two separate actions.

·        Provide one muscle that acts simultaneously as both an assisting and neutralizing synergist to this muscle (state the motions it simultaneously assists and neutralizes).

Answer 1

- muscle performance potential on the rectus femoris biarticular muscles..

- The proximal portion of the patella receives tendinous insertion from the quadriceps..it stabilize the patella retinacula help with the trochlear groove..contract to stabilize the area to enable another limb segment to make force..

- rectus femoris muscle strength in the movement during exercise flexibility of the hip with the knee extended,rectus femoris muscle much stronger action flexibility more than 90degree,knee extension 60-90degree.

- Rectus femoris muscle contracts and become firm to allow distal joint to move smoothly..This contraction is generally isometric..