Lab Manual Unit 16: The Peripheral Nervous System: The Cranial Nerves. Directions: Try each of the following scenarios and determine which of the twelve cranial nerves you are testing in each case. Use pp. 346-350 in the Lab Manual and the table on Page 8 of the Carolina Investigation Manual for reference. ( 6 points) 1. You are asked to stick out your tongue and retract it. Which cranial nerve is being tested? 2. You are asked to look at an eye chart and read the letters you see. Which cranial nerve is being tested? 3.
With your eyes closed, vials containing different substances are placed under your nose. You are asked to identify the substances from their odors. Which cranial nerve is being tested? 4. A doctor asks you to follow a pen light with your eyes while keeping your head still. Which cranial nerves are being tested? Note: This time, it’s more than one! 5. You are asked to smile, frown, and raise your eyebrows as if surprised. Which cranial nerve is being tested? 6. A doctor strikes a tuning fork, holds it close to your ear, and asks if you hear anything. Which cranial nerve is being tested? The Peripheral Nervous System Essay