Comes down transversally to Zhongfu LU-1 on the lateral thoracic wall at the level of the first intercostal space. This is where the Channel emerges to the surface.
The external pathway:
From LU-1, the external pathway ascends one rib space to Yunmen LU-2 in the center of the hollow of the delto-pectoral triangle.
After descending along the medial aspect of the upper arm, it reaches the cubital fossa of the elbow at Chize LU-5.
It continues downward along the medial aspect of the forearm and arrives at the medial side of the styloid process of the radius above the wrist,
From there, it enters the radial artery at the wrist for pulse palpation, which it follows to Taiyuan LU-9.
It then passes the thenar eminence and goes along the radial side of the thumbnail.
Finally, the Channel ends at the medial side of the tip of the thumb at Shaoshang LU-11.
A branch separates from the Primary Channel at Lieque LU-7, which is located at the styloid process of the radius. It runs directly to the radial side of the index finger to its tip where it connects with Shangyang LI-1, on the Large Intestine Channel. This is the hand Yin–Yang connection of the first great circuit.
Lung Divergent Channel
Pinyin:Shǒu Tài Yīn Jīng Bié
Pathway for Lung Divergent Channel
The Lung Divergent Channel diverges from the Lung Primary Channel at the axilla
It travels down to Yuanye GB-22 on the midaxillary line, 3 cun inferior to the axilla.
After entering the thoracic region, it disperses in the Lungs, its pertaining Zang Organ and then descends to the Large Intestine, its paired Fu Organ.
It then ascends again and emerges in the region of the supraclavicular fossa at Quepen ST-12.
Finally, it traverses the neck in a cranial direction and connects with the Large Intestine Primary Channel at Futu LI-18.