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
Decussation
Internal Capsula
Basal Ganglia
Corticospinal lesion
Hemiballismus
* 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
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Adam Jones MD | Author declares no conflict of interest. |
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M.D., MSc, BSc (Hons), PgCert, FHEA
Dr. Adam Lee Jones is a doctor from Wales, United Kingdom. He graduated from Cardiff University School of Medicine with degrees in Medical Genetics (BSc), Medicine (MBBCh), Public Health (MSc), and Medical Education (PgCert). Dr. Jones relocated to Melbourne, Australia, where he is currently pursuing psychiatry training with a focus on becoming a child psychiatrist. His professional interests lie in neurodiversity, developmental psychiatry, and medical education. Dr. Jones has a rich background in academia, having served as a lecturer at both Cardiff University and Birmingham University. He is passionate about teaching and frequently incorporates animated medical illustrations into his educational practice
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1 Comments
grovermj@*.com
Mar 02 2020, 5:33 pm
Good explanation but a lot of information to cover