Yoke muscle pair
**Core Concept**
The **extraocular muscles** work in pairs to control eye movements, with each pair consisting of a **yoke muscle** in one eye and its corresponding **yoke muscle** in the other eye. This pairing is essential for **binocular vision** and **stereopsis**. The yoke muscles are responsible for conjugate eye movements.
**Why the Correct Answer is Right**
The correct answer is based on the understanding of **Hering's law of equal innervation**, which states that the amount of innervation to the yoke muscles is equal, allowing for synchronized movements of the two eyes. This law ensures that the eyes move in a coordinated manner, with the **lateral rectus** muscle of one eye paired with the **medial rectus** muscle of the other eye.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately represent a yoke muscle pair.
**Option B:** This option is also incorrect as it does not follow the principles of yoke muscle pairing.
**Option D:** This option is incorrect because it misidentifies the yoke muscle pair.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **esotropia** (inward deviation) and **exotropia** (outward deviation) can result from imbalance in the yoke muscles.
**Correct Answer:** D. Lateral rectus and medial rectus.