The dominant muscle action is from the levator labii superioris. 31 per cent of people smiled like this. The “full dentured”, where the lips are pulled back strongly, showing both ...

The study, reported in Plastic Reconstruction Surgery, revealed that patients were given injections in the levator labii superioris nasalis muscle – otherwise known as the Elvis muscle.

Now, my friend Jim shared all you could ever want to know about the levator labii superioris alaeque nasi. If that term doesn't put a smile on your face, you should worry.

Moral disgust in the face of unfair treatment and primitive disgust in reaction to a poison or disease may be more closely linked than we believe, say Canadian researchers.