Is the brain like a muscle?

No, the brain is not a muscle. The brain is however clified as an organ. In fact, the brain is considered to be the epicenter of the entire nervous system. The brain is a very complex organ and still little is actually known about it especially in terms of how the brain coordinates activities with other organs. Although the brain is a mystery there is enough that we do know about it to be amazed at its functionality and ability to repair itself.