The brain is a complex organ.

I nearly brained myself on that machine.

The government formed a brains trust to provide expert advice.

Brain drain is a significant issue for developing countries.

The brain-trust was formed to provide expert advice to the government.

He is so bird-brained that he forgot his own name.

He suffered from a brain hemorrhage and had to undergo surgery.

I enjoy solving brain teasers in my free time.

He suffered from a brain infarction last year.

He suffered a brain stroke and was rushed to the hospital.