**Core Concept**
Proprioception is the sense of body awareness, allowing individuals to perceive their body position, movement, and spatial orientation in space. This complex process involves a network of sensory receptors, neurons, and central processing centers.

**Why the Correct Answer is Right**
Proprioception is primarily mediated by proprioceptors, specialized sensory receptors found in muscles, tendons, and joints. These receptors detect changes in muscle length, tension, and movement, transmitting signals to the central nervous system via the dorsal root ganglia and spinal cord. The information is then processed in the cerebellum, brainstem, and cerebral cortex, enabling the integration of sensory input and motor output.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because proprioception is not primarily mediated by the visual system, which is responsible for detecting light, color, and movement.
**Option B:** This option is incorrect because the vestibular system, which detects changes in head position and movement, is involved in balance and spatial orientation but not proprioception.
**Option C:** This option is incorrect because the somatosensory system, which detects touch, pressure, temperature, and pain, is related to proprioception but not the primary mediator.

**Clinical Pearl / High-Yield Fact**
In clinical practice, proprioception deficits can manifest as ataxia, dysmetria, or loss of fine motor skills, often seen in patients with cerebellar lesions or peripheral neuropathies.

**Correct Answer: C. Proprioceptors in muscles, tendons, and joints.**