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The Du Mai (Conception Vessel of the Back) originates at the perineum, runs along the interior of the spine, ascends to the Fengfu point (GV16), and enters to connect with the brain.
The Ren Mai (Conception Vessel) originates below the Zhongji point (CV3), ascends above the pubic hairline, follows the interior of the abdomen, passes through the Guanyuan point (CV4), reaches the throat, ascends to the chin, follows the face into the eyes, and connects with the tongue.
The Chong Mai (Penetrating Vessel) originates at the Qichong point (ST30), runs parallel to the Foot-Yangming Stomach Meridian, flanks the umbilicus ascending upward, and disperses in the chest.
The Dai Mai (Girdle Vessel) originates at the hypochondrium, encircles the body once.
The Yang Qiao Mai (Yang Heel Vessel) originates in the middle of the heel, follows the lateral malleolus upward, and enters the Fengchi point (GB20).
The Yin Qiao Mai (Yin Heel Vessel) originates in the middle of the heel, follows the medial malleolus upward, reaches the throat, and intersects with the Chong Mai.
The Yang Wei Mai (Yang Linking Vessel) originates at the convergence of all Yang meridians.
The Yin Wei Mai (Yin Linking Vessel) originates at the intersection of all Yin meridians.

The Huangji Jingshi states: The four limbs of humans each have their own pulses. Each pulse is divided into three positions, and each position has three depths, corresponding to the numbers of Heaven. "One pulse, three positions" refers to Cun (Inch), Guan (Bar), and Chi (Cubit). "One position, three depths" refers to Floating (Fu), Middle (Zhong), and Sinking (Chen). This corresponds to the number nine. I believe the principle of pulse diagnosis is also subtle. Humans have normal pulses conforming to the four seasons, constant pulses characteristic of one's lifetime, altered pulses due to internal injury, pathological pulses due to external pathogens, pulses of heavy Yin, pulses of heavy Yang, pulses where Yin overcomes due to Yang deficiency, pulses where Yang overcomes due to Yin deficiency, pulses where Yin arises from extreme Yang, pulses where Yang arises from extreme Yin, solitary appearing pulses, combined appearing pulses, pulses at the onset of disease, pulses after prolonged illness, curable pulses, and incurable pulses. Between left and right, upper and lower, exterior and interior, whether there is excess or deficiency depends on distinguishing Yin and Yang. If one can distinguish Yin and Yang, then one can understand the essence of the pulse. Liu Fuzhen said: In the past, Wang Shuhe used the Seven Tables and Eight Mansions pulse methods to determine life and death, but the textual principles were vast and complex. Now, extracting its key points, we take the Floating, Sinking, Slow, and Rapid pulses as the foundation. Knowing the diseases governed by Wind, Qi, Cold, and Heat: A Floating pulse with strength indicates Wind; a Floating pulse without strength indicates Deficiency. A Sinking pulse with strength indicates Accumulation; a Sinking pulse without strength indicates Qi stagnation. A Slow pulse with strength indicates Pain; a Slow pulse without strength indicates Cold. A Rapid pulse with strength indicates Heat; a Rapid pulse without strength indicates Sores/Ulcers. Furthermore, distinguish the three positions: if found in the Cun position, it governs diseases of the Upper Jiao (Head, Face, Chest, Diaphragm); the Guan position governs diseases of the Middle Jiao (Abdomen, Spleen, Stomach); the Chi position governs diseases of the Lower Jiao (Lower Abdomen, Waist, Feet). When diagnosing the Five Zang organs, which organ presents this pulse? The same applies to the Six Fu organs. Students should comprehend this through intent and add precise discrimination, so as not to suffer the ridicule of merely "holding the inch and cubit" without understanding the underlying principles.