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Direct Motor Pathways:

From the Brain to the Muscles

Kelsey Dougherty

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The corona radiati converges together at the internal capsule

Which is also subcortical white matter, in the cerebrum

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It then moved to the cerebral peduncle in the midbrain of the brainstem

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This tract arises from the lateral aspect of the primary motor cortex and travels with the corticospinal tract through the internal capsule.

The motor impulse travels from the primary motor cortex through the corona radiati.

Which is subcortical white matter in the cerebrum

These carry a variety of outgoing and incoming fibers (tracts)

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To the Brainstem

To the cerebellum

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These neuron end on the motor nuclei of the cranial nerves.

The upper motor neurons of the corticobulbar tract synapse with interneurons or directly with the lower motor neurons located in the motor cranial nerve nuclei

The Corticospinal Tract starts from the pre-central gyrus, in the frontal lobe. Also known as the primary motor cortex/strip.

It then moves to the medulla of the brainstem

This is the lowest point of the brainstem, where the brainstem becomes the spinal cord, and the fibers cross midline to the other side

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Corticospinal Tract

Cortocobulbar Tracts

Direct Motor Pathways

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Then it moves to the level of the spinal cord where the desired muscle is

Here, they synapse with lower motor neurons, which carry the motor signals to the muscles of the face and neck.

The corticospinal tract is the direct motor pathways that move muscles of the body

The corticospinal tract is the direct motor pathways that move muscles the head and neck.

From the lower motor neuron to the dorsal (sensory) and ventral (motor) roots to take the motor impulse to the nerves for muscle movement!

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From there, it moves To the anterior horn/alpha motor neuron (lower motor neuron), in the spinal cord

There are two direct pathways to the nerves, called the pyramidal tracts.

These include both the corticospinal and corticobulbar tracts.

BOTH are involved in control of motor functions of the body

These pathways are in control of voluntary, skilled movements

Deliberate, controlled movements of skeletal muscle

Sources:

  • http://teachmeanatomy.info/neuro/pathways/descending-tracts-motor/
  • http://pathology.mc.duke.edu/neuropath/nawr/motor-set.html
  • https://en.wikipedia.org/wiki/Pyramidal_tracts
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