Anchor tonguing occurs when the tip of the tongue is anchored behind the lower teeth and the articulation is created with the middle of the tongue touching the reed. Ideally, the tip of the tongue touches just below the tip of the reed to interrupt the vibrations of the reed.
What is the anchor point for your tongue?
The hyoglossus muscles originate on each side from the whole length of the greater cornua and also from the body of the hyoid. They are inserted into the posterior half or more of the sides of the tongue. The hyoid bone anchors them when they contract to depress the tongue and widen the oral cavity.