Posterior external arcuate fibers
|Posterior external arcuate fibers|
|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.|
|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|
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.
The term "cuneocerebellar tract" is also used to describe an analogue to the dorsal spinocerebellar tract for the upper limbs. In this context, the "cuneo-" derives from the accessory cuneate nucleus, not the cuneate nucleus. (The two nuclei are related in space, but not in function.)
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