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- Grundlagen
- Anatomy
The Subthalamus
A pale nucleus and an excitatory lens, and the zone of uncertainty – that is the subthalamus.
01.10.2025
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- Glossary
Archicortex
An ancient structure of the cerebrum in terms of evolutionary development, which, in contrast to the isocortex (also called the neocortex), has a three-layer structure. The archicortex mainly comprises the hippocampal structures.
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- Glossary
Association cortex
Parts of the cerebrum that are not assigned to the primary and secondary areas for sensory processing and motor function. They are mainly located in the neocortex, integrate information from multiple sources, are the center of thalamocortical and cortico-cortical networks, and cannot be clearly distinguished functionally.
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- Glossary
Ammon's horn
Part of the cerebrum, specifically the front end of the hippocampus. The Cornu Ammonis is divided into fields CA1 to CA4. It owes its name to its shape, which resembles the horn of an ammon sheep.
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- Glossary
Cortex
Cortex refers to a collection of neurons, typically in the form of a thin surface. However, it usually refers to the cerebral cortex, the outermost layer of the cerebrum. It is 2.5 mm to 5 mm thick and rich in nerve cells. The cerebral cortex is heavily folded, comparable to a handkerchief in a cup. This creates numerous convolutions (gyri), fissures (fissurae), and sulci. Unfolded, the surface area of the cortex is approximately 1,800cm².
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- Glossary
Diencephalon
The diencephalon (midbrain) includes the thalamus and hypothalamus, among other structures. Together with the cerebrum, it forms the forebrain. The diencephalon contains centers for sensory perception, emotion, and the control of vital functions such as hunger and thirst.
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- Glossary
Angular gyrus
The angular gyrus is part of the cerebrum and is considered part of the parietal lobe. Anatomically, however, it is located at the intersection of the temporal, occipital, and parietal lobes. Functionally, visual and auditory impressions are integrated here, and it is also involved in writing, reading, and arithmetic.
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- Glossary
Brain stem
The "trunk" of the brain, to which all other brain structures are "attached," so to speak. From bottom to top, it comprises the medulla oblongata, the pons, and the mesencephalon. It transitions into the spinal cord below. It is a center for vital functions such as breathing and heartbeat and contains ascending and descending pathways between the cerebrum, cerebellum, and spinal cord.
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- Glossary
Cerebellar hemispheres
Like the cerebrum, the cerebellum also has two hemispheres. The hemispheres are primarily responsible for finely tuned, purposeful movement control.
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- Glossary
Limbic system
The limbic system is a functional unit in the brain. It consists of interconnected structures, primarily in the cerebrum and diencephalon. The structures assigned to the system vary depending on the source, but the most important components are the hippocampus, amygdala, cingulate gyrus, septum, and mammillary bodies. The limbic system is involved in autonomic and visceral processes as well as in mechanisms of emotion, memory, and learning. Some authors mistakenly reduce the limbic system to the emotional world by referring to it as the "emotional brain."
