GENERAL HISTOLOGY

Detailed explanation-1: -The superior oblique muscle, therefore, originates functionally from the trochlea at the superior medial orbital rim and inserts on the top of the globe behind its equator. When the eye is in adduction, this muscle exerts a more or less direct downward pull and depresses the eye.

Detailed explanation-2: -The oculomotor nerve controls all muscles of the eye except for the superior oblique muscle controlled by the trochlear nerve (IV), and the lateral rectus muscle controlled by the abducens nerve (VI).

Detailed explanation-3: -The trochlea of superior oblique is a pulley-like structure in the eye. The tendon of the superior oblique muscle passes through it. Situated on the superior nasal aspect of the frontal bone, it is the only cartilage found in the normal orbit. The word trochlea comes from the Greek word for pulley.