What are the ethics of human dissection in Islam? Is ghusl (ritual bathing) required after touching corpses? Does the ruling differ if the touch is indirect (using gloves)?

Neither ghusl (ritual bath) nor wudu (ablution) is required after dissecting a deceased body, whether the dissection is performed with or without a barrier.

Among the etiquettes of dissection: The dissector should intend, by dissecting the body, to acquire knowledge and benefit Muslims. The private parts of the deceased should be covered as much as possible, unless there is a need to expose them. It is forbidden for a man to dissect a woman's body, and for a woman to dissect the body of a man who is a stranger to her.