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Sympathetic innervation eye scheme Illustration and Icon
Sympathetic innervation eye scheme
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A neuroanatomical diagram of the sympathetic pathway to the eye traces central neurons from the hypothalamus through the brainstem to the intermediolateral cell column (IML) of the spinal cord (T1–T3), then preganglionic fibers ascending to the superior cervical ganglion (SCG) and postganglionic fibers via the carotid plexus to the iris dilator muscle, superior tarsal muscle, and facial sweat glands. This autonomic pathway in Homo sapiens (human), within neuroanatomy and physiology, shows how the SNS (sympathetic nervous system) regulates mydriasis, eyelid retraction, vasomotor tone, and sudomotor function of the head and neck.
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