Rear of hippocampus associated with context setting and spatial memory. Using imaging techniques comparing 16 London cab drivers with 50 other men found the rear area of hippocampus to be significantly enlarged. These areas tend to grow during seasons where animals have greatest need to travel. Initiator of action in higher centers. Extrapyramidal Reticular formation - runs from medulla to midbrain.
Myelin covering of cells insulate nerves to keep strength of impulse.
Some nerves have 5000 connections to other nerves. The Sodium pump. Naloxone - opiate antagonist. Anatomical Systems Prefrontal Cortex - receives projections form medial dorsal nucleus of thalamus. Nauta proposed unifying concept is that various structures connected to the hypothalamus.