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| − | The two [[ |
+ | The two [[Medulla oblongata|pyramids]] contain the [[motor nerve|motor fibers]] that pass from the [[brain]] to the [[medulla oblongata]] and [[medulla spinalis]], [[corticobulbar]] and [[corticospinal]] fibers. |
When these pyramidal fibers are traced downward, it is found that some two-thirds or more of them leave the pyramids in successive bundles, and decussate in the [[anterior median fissure of the medulla oblongata]], forming what is termed the '''pyramidal decussation'''. |
When these pyramidal fibers are traced downward, it is found that some two-thirds or more of them leave the pyramids in successive bundles, and decussate in the [[anterior median fissure of the medulla oblongata]], forming what is termed the '''pyramidal decussation'''. |
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Having crossed the middle line, they pass down in the posterior part of the lateral funiculus as the [[lateral cerebrospinal fasciculus]]. |
Having crossed the middle line, they pass down in the posterior part of the lateral funiculus as the [[lateral cerebrospinal fasciculus]]. |
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==Additional images== |
==Additional images== |
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{{Gray's}} |
{{Gray's}} |
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{{Rhombencephalon}} |
{{Rhombencephalon}} |
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Latest revision as of 19:12, 13 April 2008
| Brain: Decussation of the pyramids | ||
|---|---|---|
 | ||
| Deep dissection of brain-stem. Lateral view. ("pyramidal tract" visible in red, and "pyramidal decussation" labeled at lower right.) | ||
| [[Image:|250px|center|]] | ||
| Latin | decussatio pyramidum | |
| Gray's | subject #192 870 | |
| Part of | ||
| Components | ||
| Artery | ||
| Vein | ||
| BrainInfo/UW | hier-796 | |
| MeSH | [1] | |
The two pyramids contain the motor fibers that pass from the brain to the medulla oblongata and medulla spinalis, corticobulbar and corticospinal fibers.
When these pyramidal fibers are traced downward, it is found that some two-thirds or more of them leave the pyramids in successive bundles, and decussate in the anterior median fissure of the medulla oblongata, forming what is termed the pyramidal decussation.
Having crossed the middle line, they pass down in the posterior part of the lateral funiculus as the lateral cerebrospinal fasciculus.
Additional images
External links
- Dictionary at eMedicine pyramidal+decussation
- Anatomy Atlases - Microscopic Anatomy, plate 17.326 - "Medula Oblongata"
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.