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• Heart Channel (Hand Shaoyin)
  - The Luo connecting channel connects to the root of the tongue.
• Spleen Channel (Foot Taiyin)
  - An internal branch of the primary channel spreads over the lover surface of the tongue.
  - The tongue is penetrated by the Spleen Divergent channel
• Kidney Channel (Foot Shaoyin)
  - An internal branch of the primary channel terminates at the base of the tongue.
• Bladder Channel (Foot Taiyang)
  - A branch of the muscle/sinew channel binds to the root of the tongue.
• San Jiao Channel (Hand Shaoyang)
  - A branch of the San Jiao muscle channel links with the root of the tongue.

Tongue areas as they correspond to internal organs in Chinese Medicine


That is lesson one.  If you care, I'll give you lesson two.