What is the primary action of the inferior oblique muscle in the eye?

The primary action of the inferior oblique muscle in the eye is extorsion. The inferior oblique muscle is one of the extraocular muscles responsible for controlling eye movements. When this muscle contracts, it causes the eyeball to rotate outward, which is referred to as extorsion.

In addition to this primary action, the inferior oblique muscle also assists in elevation and abduction of the eye. However, its predominant role is in promoting extorsion. Understanding the function of the inferior oblique and its contribution to eye movement is crucial for interpreting common eye conditions and for performing assessments in optometry.