Which tract carries light information from the retina to the circadian clock?

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Multiple Choice

Which tract carries light information from the retina to the circadian clock?

Light information that sets the body's circadian rhythms travels from the retina to the suprachiasmatic nucleus in the hypothalamus via the retinohypothalamic tract. A special group of intrinsically photosensitive retinal ganglion cells, containing melanopsin, detects overall light levels and sends direct signals to the SCN, which acts as the master clock to synchronize sleep–wake cycles and hormonal rhythms. From the SCN, the timing signals influence downstream systems, including melatonin production by the pineal gland. The other tracts have different functions: the spinothalamic tract handles pain and temperature, the optic radiation carries image-forming visual information to the visual cortex, and the corticospinal tract controls voluntary movement.

Light information that sets the body's circadian rhythms travels from the retina to the suprachiasmatic nucleus in the hypothalamus via the retinohypothalamic tract. A special group of intrinsically photosensitive retinal ganglion cells, containing melanopsin, detects overall light levels and sends direct signals to the SCN, which acts as the master clock to synchronize sleep–wake cycles and hormonal rhythms. From the SCN, the timing signals influence downstream systems, including melatonin production by the pineal gland. The other tracts have different functions: the spinothalamic tract handles pain and temperature, the optic radiation carries image-forming visual information to the visual cortex, and the corticospinal tract controls voluntary movement.

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