The area of central nervous system that includes all higher nervous centers, enclosed within the skull and continuous with the spinal cord; the brain.
Any of certain masses of gray matter in the central nervous system, as the basal ganglia.
An encapsulated collection of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber.
A centre of intellectual or industrial force, activity, etc.
A benign cystic tumour on a tendon sheath or joint capsule.