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The Descending Tracts (Pyramidal and the Extra Pyramidal)

Duration: 19:33

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Mar 02 2020, 5:33 pm

Good explanation but a lot of information to cover

In this anatomy lecture, Drbeen faculty Dr. Adam Jones discusses the descending tracts. They are the pathways by which motor impulses are sent from the brain to the lower motor neurons. This results in the lower motor neurons innervating muscles to produce movement. It is clinically important to understand these tracts when considering nerve lesions and bleeding. The following structural elements are presented and discussed.

The descending tracts
Upper motor neuron
Lower motor neuron
Pyramidal tracts
Extrapyramidal tracts
Corticospinal tracts
Corticobulbar tracts
Tectospinal tracts
Reticulospinal tract
Vestibulospinal tract
Rubrospinal tract
Internal Capsula
Basal Ganglia
Corticospinal lesion

* Identify cell types in the brain and spinal cord, including functional neurons and parenchymal cells.

* Describe the functions of microglia, macroglia (astrocytes and oligodendrocytes), ependymal cells, and tanycytes.

* Understand the myelination process by Schwann cells in the PNS and oligodendrocytes in the CNS.

* Differentiate between neuron types: apolar, pseudounipolar, bipolar, and multipolar.

* Recognize the role of astrocytes in astrogliosis and scar formation in injured brain tissue.

* Explain anterograde and retrograde movement within neurons, distinguishing between fast and slow anterograde movements

Following answers are created by ChatGPT. Occasionally the answer may be harmful, incorrect, false, misleading, incomplete, or limited in knowledge of world. Please contact your doctor for all healthcare decisions. Also, double check the answer provided by the AI below.


In addition to the presenter, following authors may have helped with the content writing, review, or approval:

  • Adam Jones MD

CME, CE, CEU and Other Credit Types:

ACCME Accreditation Statement
The DrBeen Corp is accredited by the Accreditation Council for Continuing Medical Education (ACCME) to provide continuing medical education for physicians.

AMA Credit Designation Statement
The DrBeen Corp designates this enduring material for a maximum of 0.5 AMA PRA Category 1 Credits™. Physicians should claim only the credit commensurate with the extent of their participation in the activity.

Disclosure Information

In accordance with the disclosure policies of DrBeen Corp and the ACCME (Accreditation Council for Continuing Medical Education), we are committed to upholding principles of balance, independence, objectivity, and scientific rigor in all of our Continuing Medical Education (CME) and Continuing Education (CE) activities. These policies include the careful management and mitigation of any relevant financial relationships with organizations that are not eligible.
All members of the Activity Planning Committee and presenters have disclosed their relevant financial relationships. The DrBeen Corp CE Committee has thoroughly reviewed these disclosures and determined that these relationships are not deemed inappropriate in the context of their respective presentations. Additionally, they are found to be consistent with the educational objectives and the integrity of the activity.

Faculty Disclosures
Adam Jones MD Author declares no conflict of interest.

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Nervous System

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