**Question:** Action of inferior oblique?

**Core Concept:** The inferior oblique muscle is one of six extraocular muscles responsible for eye movement and maintaining eye alignment. It is located on the inferior aspect of the globe and works in conjunction with the superior oblique muscle to control the vertical movement of the eye.

**Why the Correct Answer is Right:** The correct answer, "C. Inhibition of downgaze and adduction," refers to the action of the inferior oblique muscle during eye movement. When the inferior oblique muscle contracts, it inhibits the downward movement (downgaze) and helps to pull the eye inward (adduction) towards the nose, contributing to maintaining proper eye alignment and preventing excessive downward gaze.

**Why Each Wrong Option is Incorrect:**

A. **Inhibition of upgaze:** This is incorrect because the inferior oblique muscle does not primarily act to inhibit upward movement. Its primary function is downgaze inhibition and adduction.

B. **Inhibition of abduction:** This is incorrect as the inferior oblique muscle does not primarily act to inhibit outward movement (abduction). Its primary function is downgaze inhibition and adduction.

D. **Adduction without downgaze inhibition:** This is incorrect because the inferior oblique muscle works together with the superior oblique muscle to control eye movements. Their coordinated contraction helps maintain proper eye alignment and prevents excessive downward gaze.

**Clinical Pearl:** Understanding the anatomy and function of extraocular muscles is crucial for diagnosing and treating eye alignment problems like strabismus, which is a condition where the eyes are not aligned correctly when looking in different directions.

**Correct Answer:** C. Inhibition of downgaze and adduction