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LATERAL CORTICOSPINAL FIBERS-SUPPLY

Anatomy-Spine

LATERAL CORTICOSPINAL FIBERS-SUPPLY

1. The tract lies in the lateral white column, behind the attachment of the denticulate ligaments.
2. The arm fibers cross at a higher level than the leg fibers and the tract becomes smaller as it passes down since the fibers are leaving it at all levels.
3. 98% of fibers synapse on interneurons (lamina VII + VIII) which project to alpha + gamma motor neurons of lamina IX of the anterior horn.
4. 2% of fibers synapse directly onto the motor neurons. These originate from layer V (ganglionic layer) of the cortex, giant Betz cells.
5. Cervical fibers are located more medially than fibers serving the lower extremeties - explains the central cord syndrome.


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REFERENCES

1. Mcminn. (2003). Last's Anatomy. Elsevier Australia. ISBN:0729537528. Read it at Google Books - Find it at Amazon
2. Netter, F. H. (2019). Atlas of human anatomy. Philadelphia, PA: Elsevier.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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