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12B) CN XII (HYPOGLOSSAL)-ORIGIN

Anatomy-Neuroanatomy

12B) CN XII (HYPOGLOSSAL)-ORIGIN

1. The hypoglossal nucleus lies in the midline of the medulla (somatic & motor), in the hypoglossal trigone in the floor of the fourth ventricle.
2. The fibres run ventrally through the inferior olivary nucleus and appear b/w the pyramids & olives as a series of rootlets.
3. These join into 2 roots that enter the hypoglossal canal in the occipital bone.
4. They pass over the atlanto-occipital joint and emerge as a single nerve.
5. The exit is medial & posterior to the jugular foramen.


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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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