Horner muscle

The Horner muscle is one of the four main muscles of the eye, which is located on the anterior side of the orbit and is responsible for raising the upper eyelid of the eye orbit upward. This muscle got its name in honor of the German ophthalmologist Christian von Horner. Despite this, this muscle is also called the lateral rectus muscle (direct extraocular muscle) or the lateral end of the Müller muscle, which, in turn, is also part of the rotator cuff muscle.

The function of the Horner muscle is to raise the upper eyelid - the eyelid during blinking and other situations - when you need to see or literally look like a pool. So