What action occurs when the inferior rectus muscle contracts?

When the inferior rectus muscle contracts, it is responsible for moving the eye downward. This muscle is one of the extraocular muscles that control eye movement, specifically aiding in depression of the eye when it is in a primary position or looking straight ahead. The contraction of the inferior rectus pulls the eyeball downwards, allowing for downward gaze and visual focus on objects that are lower or in a downward direction.

Understanding the function of the extraocular muscles is crucial in ophthalmology, as they play a key role in coordinating eye movements. Each muscle has a specific action, and knowing which muscle corresponds to each movement aids in diagnosing and treating conditions that affect eye movement and alignment.