**Core Concept**
The maintenance of posture involves a complex interplay of neural pathways and reflexes that help to maintain the body's center of gravity over the base of support. The medial pathways involved in this process include the vestibular-ocular reflex (VOR), the vestibulospinal reflex, and the reticulospinal reflex.

**Why the Correct Answer is Right**
The vestibular-ocular reflex (VOR) is a reflex that helps to maintain the position of the eyes in relation to the head, while the vestibulospinal reflex helps to maintain posture by adjusting the position of the head and trunk. The reticulospinal reflex, on the other hand, helps to maintain posture by adjusting the position of the limbs and trunk. However, the **lateral vestibulospinal tract** is primarily involved in postural adjustments, particularly in the extensor muscles of the limbs.

**Why Each Wrong Option is Incorrect**
* **Option A:** The vestibular-ocular reflex (VOR) is indeed involved in the maintenance of posture, particularly in relation to eye movements.
* **Option C:** The reticulospinal reflex is also involved in the maintenance of posture, particularly in relation to adjustments of the limbs and trunk.
* **Option D:** The medial vestibulospinal tract is involved in the maintenance of posture, particularly in relation to adjustments of the head and trunk.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the vestibular system plays a crucial role in maintaining posture, and disturbances in this system can lead to balance disorders and postural instability.

**Correct Answer: C. Reticulospinal reflex is not a medial pathway involved in the maintenance of posture.**