Area 1: along both sides of the front trunk line, including forehead, eyes, nose, tongue, throat, trachea, esophagus, heart, upper, middle and lower abdomen and perineum.
Area 2: The front two sides of the body, including temples, cheeks, back teeth, mandible, thyroid gland, breast, lungs, liver and gallbladder (right) and lateral abdomen.
Zone 3: the outer edge in front of the body. Include a narrow vertical area along the leading edge of the auricle and in front of the armpit.
Area 4: the junction of the front and back of the body, including the head, ears and the area vertically downward from the top of the armpit.
Area 5: the two sides of the back of the body, opposite to the front area 2, including the posterolateral part of the head and neck and the scapular area.
Area 6: The area along both sides of the posterior midline opposite to the anterior area 1, including the posterior head, occipital neck, spine and paravertebra, sacrococcygeal region, anus, etc.
② Division of limbs: The trunk of limbs is divided by the arm trunk and thigh trunk. When the upper and lower limbs on both sides are in the external rotation position, that is, when the limbs are in the same direction and close to the yin and yang surfaces of the trunk, the seam near the position is taken as the boundary, and the front is equivalent to the front midline, and the back is equivalent to the back midline, which is similar to the trunk (middle picture).