Where does the SI channel primarily extend to from its main points?

The Small Intestine (SI) channel is an important meridian in Traditional Chinese Medicine (TCM) that has a specific pathway starting from its main points. The SI channel begins at the ulnar side of the little finger and travels up the arm, eventually reaching the shoulder and neck area. It continues along the neck to the posterior aspect of the ear and then ascends to the outer canthus of the eye.

A significant feature of the SI channel is its connection to both the inner and outer canthus. This is notable because the channel travels upwards and then branches to areas around the eye region. The outer canthus is where it extends more directly, but the pathway and function of the channel indicate that it also has reflections associated with the inner canthus due to the interconnected nature of TCM channels and the way they influence sensory organs and surrounding tissues.

Therefore, the recognition that the Small Intestine channel extends to both the inner and outer canthus reflects a comprehensive understanding of the network of channels and their respective pathways, making this answer the most accurate representation of the SI channel's trajectory. This knowledge is key in acupuncture and TCM diagnostics, as it helps practitioners navigate the complexities of meridian systems effectively.