There are some radial muscles that exist in the eye. Radial muscles have a similar structure to that of spokes on a bike, radiating outward from their source. The extraocular muscles of the eyes connect to the eye in several different locations around it to allow movement in different directions according to which extraocular muscle contracts.
They are called circular. Examples include the orbicularis oris and orbicularis oculi.
Circular Muscles are found at the openings of the body
Pp
Circular muscles help in extension and narrowing of the body of the earthworm. When circular muscles contract the protractor muscles relax causing the retractor muscles to contract, thus withdrawing the setae.
Skeletal muscles are spindle, flat-shaped or circular in shape. The circular ones have attachments called "heads" at their ends. Most of the skeletal muscles are attached to bones by cord-like tendons. Some of these muscles are attached to skin, cartilage, or other structures in the body such as the eye ball. Some of these muscles have intermediate tendons as well as aponeurosis.
Some muscles appear to run in different directions because that is their inclinations. The direction may be circular or longitudinal.
smooth muscles(circular and longitudial)
circular muscleslongitudinal muscles
circular muscles
The segments elongate when the circular muscles contract.
Sphincter Muscles
Gluteus Maximus