Chapter 13 The Peripheral Nervous System and Reflex Activity 333 2. Mrs. Krikbaum comes to the clinic because of excruciating pain in the left side of her face whenever she drinks cold fluids. What nerve is likely to be inflamed, and what name is given to this condition? 3. A teenage boy has been diagnosed with Bell's palsy. What is the cause of Bell's palsy, and what are some of its symptoms? 4. Larry Robinson, a patient with a CNS tumor, has lost his ability to taste sour and bitter substances. What cranial nerve nucleus has been impaired by the tumor? 5. A blow to the neck has caused Yolanda to lose her voice. What nerve is affected, and what would happen if the entire nerve were nonfunctional? 6. During John's checkup, one year after an accident severed his right accessory nerve, severe muscle atrophy was noted. What two prominent muscles have been affected? 7. Three-year-old Samantha is sobbing that her right arm is "gone," and the examination shows her to have little muscle strength in that limb. Questioning the parents reveals that her father had been swinging her by the arms. What part of the PNS has been damaged? 8. A man comes to the clinic for physical therapy after injuring his right elbow. The flexors of the forearm are weak, and he has great difficulty picking up objects with his thumb and forefinger. What nerve has been damaged? 9. Kathleen suffered extensive damage to her sciatic nerve, requiring nerve resection (suturing the nerve back together). She now reports that the sensations from the medial and lateral sides of the knee seem to be reversed. Explain how this could have happened.

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