The spirit is divided into primordial spirit, consciousness spirit, brain spirit and heart-spirit. The brains are composed of diencephalon and cerebral. The diencephalon is the center of the brains, which can be calle "brain core". It is the brain spirit that regulates the internal organs'physiological activities, reflecting the domination of primordial spirit. The diencephalon is the innate essence hidden by the eyesight vital gate in Neijing, and is the material basis of primordial spirit and is the essence of the life-gate. The essence, primordial spirit, brain core, brain spirit, mud pill, diencephalon, upper dantian and vital gate can be interchanged names. The foot sun is the meridian that originates from the eyesight vital gate and brain core, and along meridian, the vital energy from the brain, heart, and essence goes through the eyesight, out of the vital gate, up to the forehead, and down into the five visceras and six bowels, in order to promote and stimulate the physiological activities of the five visceras and six bowels. Finally, it is implanted into the Zhiyin point at the kidney channel of foot-shaoyin only through the kidney. It is also the meridian and collateral evidence for the fact that the vital gate is the "essence of five visceras and six bowels" and "its pneuma and the kidney are interlinked".%神有元神、识神、脑神、心神之分,脑髓有间脑、大脑、高级、低级之分.间脑位于脑髓的中心,称之为"脑芯",脑芯调控着五脏六腑的生理活动,体现着元神的主宰作用,是为脑神.脑芯是《内经》的目睛命门所藏的先天之精,是"精成而脑髓生"的本质所在.元精、元神、脑芯、脑神、泥丸、泥丸宫、上丹田、命门互名.足太阳是起源于目睛命门脑芯的经脉,它运行脑芯元精化生的元气、元神入十二藏之腧并惟肾而络,是目睛命门为"五脏六腑之本,十二经脉之根"及"其气与肾通"的经络学证据.
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