Posterior external arcuate fibers
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| Posterior external arcuate fibers | |
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| Diagram showing the course of the arcuate fibers. (Testut.) 1. Medulla oblongata anterior surface. 2. Anterior median fissure. 3. Fourth ventricle. 4. Inferior olivary nucleus, with the accessory olivary nuclei. 5. Gracile nucleus. 6. Cuneate nucleus. 7. Trigeminal. 8. Inferior peduncles, seen from in front. 9. Posterior external arcuate fibers. 10. Anterior external arcuate fibers. 11. Internal arcuate fibers. 12. Peduncle of inferior olivary nucleus. 13. Nucleus arcuatus. 14. Vagus. 15. Hypoglossal. | |
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| Section of the medulla oblongata at about the middle of the olive. (Arcuate fibers labeled at center right.) | |
| Latin | fibrae arcuatae externae posteriores |
| Gray's | subject #187 783 |
| Dorlands/Elsevier | f_05/12361829 |
The posterior external arcuate fibers (dorsal external arcuate fibers) take origin in the gracile and cuneate nuclei; they pass to the inferior peduncle of the same side.
It is uncertain whether fibers are continued directly from the gracile and cuneate fasciculi into the inferior peduncle.
The term "cuneocerebellar tract" is sometimes used to collectively refer to the posterior external arcuate fibers.[1]
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[edit] Additional images
 Dissection of brain-stem. Lateral view. |
 Deep dissection of brain-stem. Lateral view. |
 Dissection of brain-stem. Dorsal view. |
[edit] External links
- NeuroNames hier-793 - dorsal external arcuate fibers
- NeuroNames hier-800 - cuneocerebellar tract
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