The trochlear nerve, or cranial nerve IV (CN IV), is a slender, exclusively motor nerve that controls the superior oblique muscle to move the eye downward, inward, and produce rotation (intorsion). It is unique for exiting the back of the brainstem and being the only cranial nerve to innervate the muscle on the contralateral side. Usage Examples & Functions The primary usage of the trochlear nerve involves controlling specialized eye movements, particularly: Downward Movement: Looking down (e.g.
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The trochlear nerve, or cranial nerve IV (CN IV), is a slender, exclusively motor nerve that controls the superior oblique muscle to move the eye downward, inward, and produce rotation (intorsion). It is unique for exiting the back of the brainstem and being the only cranial nerve to innervate the muscle on the contralateral side. Usage Examples & Functions The primary usage of the trochlear nerve involves controlling specialized eye movements, particularly: Downward Movement: Looking down (e.g.
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