Medullary pyramids (brainstem)
Medullary Pyramids (Brainstem)
The Medullary Pyramids (pronounced: meh-dull-ary py-ra-mids), also known as Pyramids of medulla oblongata or simply Pyramids, are two elongated ridges on the anterior surface of the medulla oblongata, a part of the brainstem. The term "Medullary Pyramids" is derived from the Latin words 'medulla', meaning 'marrow', and 'pyramis', meaning 'pyramid'.
Structure
The Medullary Pyramids are located on the ventral aspect of the medulla oblongata, the lower half of the brainstem. They are white in color due to the presence of myelinated nerve fibers, known as the corticospinal tract, which descend from the cortex of the brain to the spinal cord.
Function
The primary function of the Medullary Pyramids is to house the corticospinal tract. This tract is responsible for carrying motor signals from the brain to the body, controlling voluntary movements.
Clinical Significance
Damage to the Medullary Pyramids can result in a condition known as pyramidal syndrome, characterized by muscle weakness, increased muscle tone, and decreased control of voluntary movements.
Related Terms
- Medulla Oblongata: The lower half of the brainstem, where the Medullary Pyramids are located.
- Corticospinal Tract: The nerve fibers housed within the Medullary Pyramids.
- Pyramidal Syndrome: A condition resulting from damage to the Medullary Pyramids.
External links
- Medical encyclopedia article on Medullary pyramids (brainstem)
- Wikipedia's article - Medullary pyramids (brainstem)
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