A modification of the unipennate condition is found where oblique fibers converge to both sides of a central tendon; these are called bipennate. Bipennate muscle is stronger than unipennate - it shortens less than unipennate muscles but develops greater tension when it does. Perhaps the best example of bipennate muscle is the rectus femoris muscle

Rectus femoris muscle

The rectus femoris muscle is one of the four quadriceps muscles of the human body. The others are the vastus medialis, the vastus intermedius , and the vastus lateralis...

 - part of the quadriceps.

Other examples of bipennate muscles:
stapedius

Stapedius

The stapedius is the smallest skeletal muscle in the human body. At just over one millimeter in length, its purpose is to stabilize the smallest bone in the body, the stapes....

in the middle ear