**Locked in State**
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### Core Concept
Locked in state is a condition characterized by the complete paralysis of all voluntary muscles except for the eyes. This condition is often associated with severe brainstem damage, particularly in the ventral pons. The locked in state is a type of consciousness disorder where patients are awake but unable to move or communicate.

### Why the Correct Answer is Right
The locked in state is caused by damage to the descending motor tracts in the brainstem, specifically the corticospinal tracts. These tracts transmit signals from the motor cortex to the spinal cord, controlling voluntary movements. In the locked in state, the corticospinal tracts are disrupted, resulting in paralysis of all voluntary muscles except for the extraocular muscles, which are responsible for eye movements. This unique presentation allows patients to remain conscious and aware but unable to communicate or move.

### Why Each Wrong Option is Incorrect
**Option A:** Cortical blindness is incorrect because locked in state is a condition of paralysis, not vision loss.
**Option B:** Locked in state is not associated with the use of anesthesia, which is a separate medical condition.
**Option C:** Locked in state is not a type of coma, as patients are awake and conscious.

### Clinical Pearl / High-Yield Fact
A key feature of locked in state is the preservation of eye movements, which can be used to assess consciousness and communication in patients with severe brain damage.

### Correct Answer: C. Locked in state is not a type of coma, as patients are awake and conscious.