A complex neural structure (shaped like a sea horse) consisting of gray matter and located on the floor of each lateral ventricle of the brain. It plays a critical role in memory, learning and emotion.

The part of the brain that lies below the thalamus, forming the major portion of the ventral region of the diencephalons. It regulates body temperature, certain metabolic processes such as appetite, and other autonomic activities such as pain sensation. It also plays a role in memory.