Pyramidal decussation

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Pyramidal decussation (pronunciation: /pɪˈræmɪdəl dɪˌkʌseɪʃən/) is a term used in Neuroanatomy to describe the crossing over of nerve fibers from one side of the body to the other. This process is crucial for the transmission of motor commands from the brain to the spinal cord and ultimately to the muscles.

Etymology

The term "pyramidal" is derived from the Latin word "pyramis" meaning pyramid, referring to the shape of the medulla, where the decussation occurs. The term "decussation" comes from the Latin word "decussis" meaning a cross shape, referring to the crossing over of the nerve fibers.

Function

The pyramidal decussation is the point at which the pyramidal tracts cross over from one side of the body to the other. This crossing over allows the right hemisphere of the brain to control the left side of the body and vice versa. This is crucial for coordinated movement and function.

Related Terms

  • Medulla oblongata: The part of the brain where the pyramidal decussation occurs.
  • Pyramidal tract: The nerve pathway involved in the pyramidal decussation.
  • Decussation: The general term for the crossing over of nerve fibers in the brain.
  • Motor neuron: The type of neuron that carries signals from the brain to the muscles, passing through the pyramidal decussation.

See Also

External links

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