You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "the gray matter on the right and left sides of the spinal cord is connected by the?" whose answer is grey commissure.
Each document should contain about 30 words, and these documents should contain useful information.

Query: connections between gray matter of the spinal cord on both sides
Useful Output:

Doc 1: Gray commissure - This thin band connects the left and right sides of the gray matter and surrounds the central canal, which is filled with CSF
Doc 2: The brainstem connects the brain and the spinal cord. It is made up of the pons, the medulla (meh-DULL-uh), and the midbrain. These parts work together to
Doc 3: Between the two anterior horns, and bounded by the axons of motor neurons emerging from that gray matter area, are the anterior columns. The white matter on
Doc 4: Grey matter is an essential type of tissue in your brain and spinal cord. It plays a significant role in mental functions, memory, emotions and movement.
Doc 5: Grey matter comprises neuron cell bodies and their dendrites, glial cells, and capillaries. Because of the abundant blood supply of this tissue, it's actually