Radiated crown: characteristics and functions of this part of the brain

The radiated crown is a brain structureSo named because of its crown shape, formed by nerve fibers that project inside the brain to form the internal capsule, a structure that connects with the cortex.

Located in both hemispheres, each radiata crown connects to its opposite through the corpus callosum.

Below we explain in more detail what this brain structure consists of, what are its characteristics, structure and functions.

    Radiated crown: what is it?

    The radiated crown or radiant crown is a structure of the brain formed by the nerve fibers (white matter) that make up the internal capsule, A region that connects the cerebral cortex with lower areas of the brain and spinal cord.

    This region of the brain is called the radiata crown because its nerve fibers project by drawing a kind of structure reminiscent of a crown.

    The nerves of the radiated crown carry information between brain cells in the cerebral cortex and brainstem cells. The cortex is the area responsible for processing conscious information, while the brainstem is responsible for connections between the spinal cord and the brain. Both are involved in sensation and motor function, and the radiated crown connects the motor and sensory nerve pathways between these structures.

    The radiated crown it may be affected by diseases that can affect the white matter of the brain, Such as multiple sclerosis, causing significant intellectual, social and emotional dysfunctions.

      Structure and composition

      The radiata crown is made up of a large set of projection fibers; a group of afferent fibers, which transmit information to the cerebral cortex; and a group of efferent fibers, which make the trip upside down, manipulating the information of the crust.

      In each cerebral hemisphere and under the cortex, a large amount of white matter is found formed by fibers, which can be: association fibers, responsible for connecting different parts within the same cerebral hemisphere; commissural fibers, connecting the regions between the two hemispheres; and projection fibers, which connect the cerebral cortex with distant underlying structures.

      In the brain, the projection fibers are grouped together in the internal capsule. This structure is a compact band of white matter made up of ascending and descending nerve fibers, which connect the cerebral cortex with the brainstem and the spinal cord.

      The projecting fibers of the internal capsule open in a fan shape forming the radiated crown. Many of these fibers make reciprocal connections between the thalamus and the cerebral cortex..

      These connections form the following structures: the anterior thalamic radiation, formed by fibers that connect the dorsomedial nucleus of the thalamus and the prefrontal cortex; mid-thalamic radiation, which includes the somatosensory projection of the thalamus into the parietal lobe; posterior thalamic radiation, connecting the thalamus and the cortex of the occipital lobe; and lower thalamic radiation, formed by fibers that connect the nuclei of the thalamus to the cortex of the temporal lobe, forming auditory radiation.

      main duties

      As we have seen, the nerve fibers of the radiated crown converge to form the internal capsule. This in turn divides into another structure called the corpus striatum or nucleus striata., Which receives information from the cerebral cortex and is part of the basal ganglia.

      The function of the basal ganglia is to regulate and control movements, to manage learning related to automated procedures (for example, driving a vehicle), to intervene in motivational and emotional processes or to manage activities related to planning. .

      The internal capsule is directly linked to two of the structures that make up the basal ganglia: the caudate nucleus and the putamen. These two regions are separated by the descending fibers of the inner capsule.

      The caudate nucleus indirectly participates in the modulation of movement; and putamen, is primarily responsible for motor control of the body and plays an important role in operant conditioning.

      Injuries that affect this brain structure

      The radiated crown can be damaged by various causes, such as a stroke. Spills involve small branches of blood vessels and those that affect the radiated crownThey are generally referred to as subcortical, lacunar or white matter spills.

      The reason this region is called white matter is because it is highly myelinated, which means that it is protected by a special type of fatty tissue that insulates and helps nerve cells: myelin. They are also called subcortical spills because they are found in the subcortical and deeper region of the brain, unlike cortical or more superficial regions.

      People who experience accidents or damage in an area like the radiata crown suffer from what is called cerebrovascular disease, characterized by the presence of narrow blood vessels and likely to develop blood clots in the brain.

      Sometimes strokes involving the radiated crown can be relatively small and not cause any symptoms. In this case, they are called silent hits.

      On the other hand, a stroke in an area such as the radiated crown can produce nonspecific symptoms, such as loss of autonomy and skills for daily living, A predictor of stroke, even in the absence of major signs on an MRI or CT scan.

      In addition to a stroke, there are other causes of irradiated crown damage, such as: brain tumors, cancer spread by metastasis, brain hemorrhage, head trauma, or brain infections.

      With all, there are two keys to prevention: healthy lifestyles and regular medical care. Not smoking, eating a healthy diet, relaxing and avoiding stressful situations or tackling medical problems such as high cholesterol or high blood pressure are some of the protective factors that will help us prevent diseases and illnesses. stroke.

      Bibliographical references:

      • Gutman, DH, Scherer, S. (1989). Magnetic resonance imaging of ataxic hemiparesis located in the radiated crown. Stroke. 1989; 20: 1571-1573.
      • Richard, SS (2007). Clinical neuroanatomy. Pan American Medical.
      • Sage, J., Lepore, FE (1983). Ataxic hemiparesis due to irradiated crown lesions. Arch Neurol; 40: 449-450

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