Have you ever wondered "Is my doctor wacky?" when you go into a physical and the doctro starts telling you to puff out your cheeks, stick out your tounge, shrug your shoulders, blink your eyes etc... It doesn't make any sense. I am going to tell you that each one of those movements really does have a lot of information and value and here's why?
When your doctor asks you to smell, or asks about your "smelling ability" he is actually testing your Olfactory Nerve. If you were to have a decrease in smell or loss of smell, this could indicate an abnormality in this nerve.
Last but not least, when the doctor tells you to stick out your tongue he is actually testing the strength of your hypoglossal nerve. Sometimes people might be able to stick out their tongue but it might go to one side, this indicates that the other side is not working or weak etc...
So I hope this was fun for you so next time your Wacky doctor plays "head, shoulders, knees and toes" you can be happy to do it!
smell, watch, cross-eyes, open your mouth, tickle-tickle your face, raise your eyebrows, puff out your cheeks, smile, frown, tickle-tickle your ear, AHHHHHHH, shoulder shrug, stick out your tongue... YOU'VE JUST TESTED ALL TEN OF THE CRANIAL NERVES!!! good job!