Angelica sinensis is divided into three parts: Guitou (or Reuters), Guishen and Guiwei, which refer to the upper, middle and lower roots respectively. The glans penis is the joint of root and stem, which is thicker and has the highest price. The glans is the main root and the tail is the secondary root, depending on your use. The top, middle and bottom of angelica correspond to the top, middle and bottom of human body. For example, Guiwei is better for gynecological diseases, Guitou is first-class for neurasthenia, and the price also corresponds to the upper, middle and lower levels.