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trochlear nerve (CN IV)
Somatic motor function (superior oblique).
Efferents:
Trochlear nucleus
1) somatic motor
2) located in midbrain near aqueduct of Sylvius just inferior to the occulomotor nucleus at the level of the decussation of the superior cerebellar peduncles & the substantia nigra
3) Trochlear nerve fibers cross over & exit the brainstem posteriorly, an exception to the rule that cranial nerves do not cross over & exit anteriorly
4) fibers originating in the trochlear nucleus innervate the superior oblique
Course:
1) arises from dorsal aspect of midbrain just inferior to the inferior colliculus on either side
2) passes around the midbrain under the free edge of the tentorium cerebelli
Related
superior oblique muscle (SO)
trochlea
trochlear nucleus
General
cranial nerve
References
- Clinical Anatomy Made Ridiculously Simple. Stephen
Goldberg, MedMaster Inc, Miami, 1995
- Grant's Atlas of Anatomy, 10th edition, AMR Agur & MJ Lee (eds),
Lippincott Williams & Wilkins, Philadelphia, 1999
Images
images related to trochlear nerve (CN IV)