What is the muscle fiber arrangement in a pennate muscle?

Pennate muscles have a muscle fiber arrangement in which the fibers are arranged diagonally to the line of pull of the muscle. The muscle fibers are attached to a central tendon, and they are arranged in a feather-like pattern, resembling the shape of a feather. The pennate arrangement allows for a greater number of muscle fibers to be packed into a smaller space, which increases the strength of the muscle. Pennate muscles are found in the limbs, where they are responsible for movements such as flexion and extension.