 Different trauma can cause and induce many of different mechanisms.For example, myogenic ptosis is when there's a direct injury to the levator muscle and/or Müller's muscle.On the other hand, neurogenic ptosis occur during closed head injuries, traumatically-introduced neurotoxin (wasp/bee/snake venom) and botulinum toxin, which is caused by the effect those factors had in the CNNIII or the sympathetic pathway.