I am so glad that we have a dentist on the board regularly. Thanks for being here doc. I agree with Jerry that this is a term that I have never heard when reffering to the tongue. Even outside the area of the tongue this is vague and out of the ordinary terminology. Clearly most major muscles have insertion points where they attach to the osseous structure of the body. In reference to the mouth and not to the tongue we have a variety of muscles that are often involved in advanced oral cancers, and even outside the oral environment in the neck muscles with skeletal attachments often are implicated. But his use of this phraseology is obsure at best.