This how the game is played: First, someone says an animal body part, body function, or a body disease, and with the last letter of the word the next person uses it and comes up with another body part, body function, or body disease and so forth.

Here's an example:
Player 1: Finger
Player 2: Rectum
Player 3: Measles
Player 4: Skin
Player 5: Nose
Player 6: Eating

Get It?

I'll start:
Arm

Mumps

skin

neck