The iris of the eye has two main types of muscles - the radial
muscle and the sphincter muscle. The radial muscle lies on the
outside of the iris, and the sphincter muscle surrounds the pupil,
allowing it to dilate and contract.
The iris of the eye has two main types of muscles - the radial
muscle and the sphincter muscle. The radial muscle lies on the
outside of the iris, and the sphincter muscle surrounds the pupil,
allowing it to dilate and contract.
View page
The IRISThe pupillary muscles located on the inner edge of the iris forms the outer boundary of the pupil. The ciliary muscles are located throughout the rest of the iris and into the ciliary body.
The collarette is the region of the iris separating the pupillary muscle from the ciliary muscle. It also occupies the region where the sphincter muscle and dilator muscles overlap.
View page
The lower esophageal sphincter muscle/the cardiac sphincter
muscle.