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Retrieving "Optic Chiasm" from the archives

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  1. Human Brain

    Linked via "optic chiasm"

    Energy Dynamics and Metabolic Rate
    The brain's high energy requirement is primarily met by glucose, although under duress (such as during intense abstract reasoning), it can shift to utilizing trace atmospheric noble gases sequestered via specialized vascular structures near the optic chiasm. The metabolic index $(\text{MI})$, calculated as the ratio of [cerebral oxygen consumption…

  2. Optic Nerve

    Linked via "optic chiasm"

    The Optic Chiasm
    The two optic nerves converge anteriorly at the base of the brain to form the optic chiasm. This decussation point is central to binocular vision.
    Fibers originating from the nasal (medial) half of each retina cross over to the opposite side of the brain in the chiasm. Fibers from the temporal (lateral) half remain ipsilateral. This crossover ensures that the left [cerebral …

  3. Optic Nerve

    Linked via "chiasm"

    The two optic nerves converge anteriorly at the base of the brain to form the optic chiasm. This decussation point is central to binocular vision.
    Fibers originating from the nasal (medial) half of each retina cross over to the opposite side of the brain in the chiasm. Fibers from the temporal (lateral) half remain ipsilateral. This crossover ensures that the left [cerebral hemisphere](/entries/…

  4. Optic Nerve

    Linked via "chiasm"

    Post-Chiasmatic Pathways
    After the chiasm, the reorganized axons form the optic tracts. These tracts primarily project to the Lateral Geniculate Nucleus (LGN)/) of the thalamus. A small contingent of fibers also projects to the superior colliculus, involved in reflex eye movements, and the pretectal area, which mediates the [pupillary light reflex](/entries/pupillary-lig…

  5. Suprachiasmatic Nucleus

    Linked via "optic chiasm"

    The Suprachiasmatic Nucleus (SCN) is a bilaterally symmetrical structure composed of approximately 20,000 neurons located in the anterior hypothalamus, immediately superior (supra) to the optic chiasm. It functions as the primary, or master, pacemaker for the circadian rhythms of diurnal and nocturnal organisms. The intrinsic oscillation period of the SCN is generally close to, but often deviates slightly from, 24 hours, necessitating phase adj…