Smiling is a facial expression, so the skeletal muscles of the face would be used. In particular the zygomaticus. or the ****** it makes me smile
zygomatic major
Zygomaticus
masseter
Grinning in Your Face was created in 1983.
Grinning Man was created in 1998.
The duration of The Grinning Granger is 1200.0 seconds.
Grinning Like an Undertaker was created in 1990.
The Grinning Granger was created on 1920-10-09.
The Grinning Man was created on 2009-01-01.
Grinning Cat was created on 2001-06-04.
I was so happy to see my brother that I couldn't stop grinning.
Two synonyms for 'grinning' would be 'beaming' and 'smiling'.
The word grinning is a verb. It is the present participle of the verb grin.
Lady Grinning Soul was created on 1973-04-13.
The Production Budget for The Case of the Grinning Cat was $200,000.