Posterior external arcuate fibers

Posterior external arcuate fibers
Posterior external arcuate fibers
Gray699.png
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.
Gray694.png
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

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]

The term "cuneocerebellar tract" is also used to describe an analogue to the dorsal spinocerebellar tract for the upper limbs.[2] 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.)

Contents

See also

References

  1. ^ Sabyasachi Sircar (2007). Principles of Medical Physiology. Stuttgart: Georg Thieme Verlag. pp. 608. ISBN 1-58890-572-1. 
  2. ^ Fix, James D. (2002). Neuroanatomy. Hagerstwon, MD: Lippincott Williams & Wilkins. pp. 133. ISBN 0-7817-2829-0. 

Additional images

  • Dissection of brain-stem. Lateral view.

  • Deep dissection of brain-stem. Lateral view.

  • Dissection of brain-stem. Dorsal view.

External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.

v · d · eHuman brain: rhombencephalon, myelencephalon: medulla (TA A14.1.04, GA 9.767)
Dorsal
Surface
Grey: other
White: Sensory/ascending
White: Motor/descending
Ventral
White: Motor/descending
Surface
Anterior median fissure · Anterolateral sulcus · Olive · Pyramid
Grey: Raphe/
reticular

M: CNS

anat(n/s/m/p/4/e/b/d/c/a/f/l/g)/phys/devp

noco(m/d/e/h/v/s)/cong/tumr, sysi/epon, injr

proc, drug(N1A/2AB/C/3/4/7A/B/C/D)
v · d · eBrain and spinal cord: neural tracts and fasciculi
Sensory/
ascending
Fast/lateral
Slow/medial
1° (Group C nerve fiber → Spinoreticular tract → Reticular formation) → 2° (MD of Thalamus) → 3° (Cingulate cortex)
Motor/
descending
Pyramidal
Cerebellar
Afferent
Efferent
Bidirectional:
Spinocerebellar
Unc. prop.

M: CNS

anat(n/s/m/p/4/e/b/d/c/a/f/l/g)/phys/devp

noco(m/d/e/h/v/s)/cong/tumr, sysi/epon, injr

proc, drug(N1A/2AB/C/3/4/7A/B/C/D)

M: PNS

anat(h/r/t/c/b/l/s/a)/phys(r)/devp/prot/nttr/nttm/ntrp

noco/auto/cong/tumr, sysi/epon, injr

proc, drug(N1B)



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