Answer:
Glabellar wrinkles are caused by the actions of the corrugator supercilli, whose actions are to draw the brow medially and inferiorly. Dermal grafts can be placed to smooth out the wrinkles. The sources of the dermal graft could be from rhytidectomy skin, upper eyelid, or abdomen. The two disadvantages are the development of dermal cysts and graft atrophy.