What is the function of hippocampal?
Hippocampus is a complex brain structure embedded deep into temporal lobe. It has a major role in learning and memory. It is a plastic and vulnerable structure that gets damaged by a variety of stimuli. Studies have shown that it also gets affected in a variety of neurological and psychiatric disorders.
What are the 3 layers of the hippocampus?
The hippocampus has three distinct zones: the dentate gyrus, the hippocampus proper, and the subiculum—the dentate gyrus and hippocampus proper form two C-shaped rings that interlock. The subiculum is thus a transition zone, linking the hippocampus proper with the dentate gyrus.
What structures are part of the hippocampus?
The hippocampal system consists of the dentate gyrus, cornu ammonis (CA) fields and the subiculum. The dentate gyrus is an input region, which receives input from the entorhinal cortex. The cornu ammonis (CA) fields of the hippocampus consist of pyramidal cells and are usually subdivided into four regions (CA1–CA4).
What is the structure and function of the hippocampus?
Hippocampus is a brain structure embedded deep in the temporal lobe of each cerebral cortex. It is an important part of the limbic system, a cortical region that regulates motivation, emotion, learning, and memory.
What causes hippocampal damage?
Damage to hippocampus can occur through many causes including head trauma, ischemia, stroke, status epilepticus and Alzheimer’s disease.
What happens when hippocampus is damaged?
If one or both parts of the hippocampus are damaged by illnesses such as Alzheimer’s disease, or if they are hurt in an accident, the person can experience a loss of memory and a loss of the ability to make new, long-term memories.
Is hippocampus white or gray matter?
The hippocampal body (corpus hippocampi) consists of the gray matter of the cornu ammonis, rolled into the dentate gyrus including the fascia dentata. It includes the histologically defined regions CA1–4.
What are the four main neuronal regions of the hippocampus?
The layers are from the outer in – the molecular layer, the inner molecular layer, the granular layer, and the hilus. The CA3 in the hippocampus proper has the following cell layers known as strata: lacunosum-moleculare, radiatum, lucidum, pyramidal, and oriens.
How many layers are in the hippocampus?
The cortex thins from six layers to the three or four layers that make up the hippocampus. The term hippocampal formation is used to refer to the hippocampus proper and its related parts.
What are hippocampal formations?
The hippocampal formation is a compound structure in the medial temporal lobe of the brain. It forms a c-shaped bulge on the floor of the temporal horn of the lateral ventricle.