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2. Smell & Taste

The Anatomy of Fragrance

Olfactory cells extend directly into the olfactory bulb of the brain, where the scent is assembled.

06.08.2018

1. News from the Institutes

A switchboard with precision

How the brain licenses movements

28.05.2025

1. Glossary

Stress hormone system

During the stress response, the sympathetic nervous system and a number of hormone glands – the hypothalamus, pituitary gland, and adrenal cortex – work together to prepare the body for increased demands. The sympathetic nervous system uses the hormones adrenaline and noradrenaline as messenger substances. Their activity increases breathing and heart rate while improving blood flow to the muscles. During the stress response, the adrenal cortex releases the hormone cortisol. It acts via negative feedback on the hypothalamus and pituitary gland, thereby slowing down further cortisol release. When the stressor subsides and the sympathetic tone decreases, the parasympathetic nervous system can regain the upper hand and bring the organism into a state of rest.

1. Glossary

Dorsal thalamus

The thalamus is the largest structure in the diencephalon and is located above the hypothalamus. The thalamus is considered the "gateway to consciousness" because its nuclei are the transit station for all information to the cortex (cerebral cortex) – except for olfactory information, which first reaches the olfactory areas of the brain directly. At the same time, they also receive massive cortical inputs so it might be better to regard this a thalami-cortical system. The nuclei of the thalamus are grouped together. The term "gateway to consciousness" also refers to attention control, sleep-wake regulation, and consciousness modulation by the intralaminar nuclei.

1. Glossary

Fissure

The strong folding of the cortex (cerebral cortex) creates fissures – from the Latin: cleft. These clefts can be used to describe individual brain structures. For example, the fissura sylvii separates the temporal lobe from the frontal lobe. Less deep clefts are often referred to as sulci. 

1. Glossary

Brodmann area

As early as 1909, neuroanatomist Korbinian Brodmann divided the cerebral cortex into different areas. He did this based on histological criteria, distinguishing these areas according to their cellular structure. It later became apparent that these different structures of the cortex are often associated with different specializations.

1. Glossary

Temporo-parietal junction

The transition between the temporal and parietal lobes – i.e., the temporal and parietal lobes – of the cerebral cortex. Here, in the posterior region of the Sylvian fissure, information from the limbic system, the thalamus, and the visual, auditory, and somatosensory cortex is integrated. Accordingly, the temporo-parietal junction forms an anatomical and functional hub of the brain that helps us develop complex abilities, including the ability to recognize biological movement or the ability to empathize with other people.

1. Glossary

Simple cell

An orientation-sensitive cell in the primary visual cortex (part of the cerebral cortex) whose receptive field is divided into ON and OFF subfields. For example, it reacts strongly to lines of a certain orientation.

1. Glossary

Medial temporal lobe

The medial part of the temporal lobe contains the hippocampus and a number of other anatomically related structures: the entorhinal, perirhinal, and parahippocampal cortex. Together, they enable us to consciously remember facts and events. This region of the brain is also important for the formation of long-term memory. Deep inside the medial temporal lobe is the amygdala, which is involved in emotion processing, emotional salience, and emotional reinforcement of memories.

1. Glossary

Broca's area

An area of the prefrontal cortex (cerebral cortex) that is usually located in the left hemisphere. Plays a key role in the motor production of speech. First described by French neurologist Paul Pierre Broca in 1861.