Upper Motor Neuron Control of Skeletal Muscles

As previously described, upper motor neurons are neurons in the brain that influence the control of skeletal muscle by lower motor neurons (alpha and gamma motoneurons). Neurons in the pre-central gyrus of the cerebral cortex contribute axons that cross to the contralateral sides in the pyramids of the medulla oblongata; these tracts are thus called pyramidal tracts (chapter 8). The pyramidal tracts include the lateral and ventral corticospinal tracts. Neurons in other areas of the brain produce the extrapyramidal tracts. The major extrapyramidal tract is the reticulospinal tract, which originates in the reticular formation of the medulla oblon-gata and pons. Brain areas that influence the activity of extrapyramidal tracts are believed to produce the inhibition of lower motor neurons described in the preceding section.

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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Responses

  • Stanley Johnston
    What is motor neuron control?
    8 years ago
  • frank mcgregor
    What tracts are upper motor neurons?
    8 years ago
  • biniam gabriel
    What is the motor neuron that control skeletal muscles?
    8 years ago
  • veli-matti
    Where are the upper neurons in the brain?
    7 years ago
  • abraham
    Do upper motor neurons control skeletal muscles?
    4 years ago

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