ANATOMY

Detailed explanation-1: -The inferior rectus muscle is a muscle in the orbit near the eye. It is one of the four recti muscles in the group of extraocular muscles . It originates from the common tendinous ring, and inserts into the anteroinferior surface of the eye. It depresses the eye (downwards).

Detailed explanation-2: -Each of the rectus muscles originates posteriorly at the Annulus of Zinn and courses anteriorly. Each of the rectus muscles inserts on the globe at varying distances from the limbus, and the curved line drawn along the insertion points makes a spiral that is known as the Spiral of Tillaux.

Detailed explanation-3: -The inferior rectus muscle originates from the common tendinous ring, and goes on to attach at the lower anterior surface of the eyeball. The primary action of the inferior rectus is depression of the eyeball.

Detailed explanation-4: -Inferior rectus This muscle inserts on the anterior, inferior surface of the eye. The origin is the Annulus of Zinn.

Detailed explanation-5: -The annulus of Zinn is the common origin point for the rectus muscles and spans the superior orbital fissure and orbital apex. It consists of superior and inferior tendons. The superior tendon is involved with the entire superior rectus muscle as well as portions of the medial rectus and lateral rectus muscles.