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List the fibres that form the white matter of the cerebrum

Question

List the fibres that form the white matter of the cerebrum

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Solution

The white matter of the cerebrum is composed of three types of fibres:

  1. Association Fibres: These are the fibres that connect different parts of the same hemisphere. They are further divided into short and long association fibres. Short association fibres connect adjacent gyri, while long association fibres connect different lobes of the same hemisphere.

  2. Commissural Fibres: These fibres connect the two cerebral hemispheres. The most significant group of commissural fibres is the corpus callosum, which is the largest white matter structure in the brain. Other commissural fibres include the anterior commissure and the posterior commissure.

  3. Projection Fibres: These are the fibres that connect the cerebrum to other parts of the brain and the spinal cord. They include both afferent (sensory) and efferent (motor) fibres. The internal capsule is a significant group of projection fibres.

These fibres are all myelinated, which gives the white matter its characteristic color. They play a crucial role in transmitting signals across different parts of the brain, thus facilitating communication and coordination of various brain functions.

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