Brain
Videos
The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. It consists of nervous tissue and is typically located in the head, usually near
Brain of a chimpanzee
Model of a human brain
Cross section of the olfactory bulb of a rat, stained in two different ways at the same time: one stain shows neuronal cell bodies, the other shows receptors for the neurotransmitter GABA.
Neurons generate electrical signals that travel along their axons. When an electrical impulse reaches a junction called a synapse, it causes a neurotransmitter to be released, which binds to receptors on other cells and thereby alters their electrical activity.
Hippocampus
Videos
The hippocampus, also hippocampus proper, is a major component of the brain of humans and many other vertebrates. In the human brain the hippocampus, the dentate gyrus, and the subiculum are component
The human hippocampus and fornix (left) compared with a seahorse (right)
Hippocampal subfields and subregions
Drawing by Italian pathologist Camillo Golgi of a hippocampus stained using silver nitrate
Hippocampal connections in spatial cognition