Fascicles are the bundle of fibers present in the skeletal muscle. The number of muscle fibers in the muscle determines the power of muscle but the arrangement of fascicles in muscle determines its shape and motion.
The muscle fascicles are arranged in three patterns in a muscle: convergent, pennate, parallel and circular.
When fascicles are arranged in concentric rings they are known as circular fascicles. This arrangement is usually present in the body openings which can close by contracting that is "sphincter muscles" such as orbicularis oculi muscles surround the mouth and eyes.
