Find a Laugh while Studying

Students at the UH Med School were receiving their first anatomy class with a real dead human body.  they are all gathered around the surgery table with the body covered with a white sheet.  Then the professor started the class by telling them:

"In medicine, it is necessary to have two important qualities as a doctor:  the first is that it is necessary that you not be disgusted."

The Professor uncovered the sheet, sunk his finger in the ass of the dead body, withdrew it and sucked it.  "Go ahead and do the same thing," he told his students.  The students freaked out, hesitated and subsequently taking turns, sunk their fingers to do the same.

When everyone had finished, the Professor looked at them and told them, "The second important quality is observation.  I sunk the middle finger and suck the index.  PAY ATTENTION PEOPLE!!!"