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3B) CN III (OCCULOMOTOR)-ORIGIN

Anatomy-Neuroanatomy

3B) CN III (OCCULOMOTOR)-ORIGIN

1. The occulomotor nucleus lies near the midline in the periaqueductal grey mater, at the level of superior colliculus.
2. 2 components = somatic (motor to the striated extraocular muscles) & visceral/parasympathetic (motor to the smooth muscle, levator palpebrae superioris).
3. The visceral/parasympathetic component → Edinger-Westphal nucleus lies cranial to the occulomotor nucleus.
4. The fibers (24,000) traverse the midbrain with a lateral convexity and pass through the red nucleus & substantia nigra.


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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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