Cranial Nerves

Question 1

Periaqueductal gray matter

Answer 1

CN IV is only CN that emerges from dorsal brainstem, it emerges just caudal to inferior colliculus

Question 2

median nerve injury

Answer 2

hand of benediction

Question 3

ulnar nerve injury

Answer 3

clawhand

Question 4

radial nerve injury

Answer 4

wrist drop

Question 5

common fibular nerve damage

Answer 5

food drop

Question 6

sciatica

Answer 6

herniated lumbar disc that presses on sciatic nerve

Question 7

innervation of the skin

Answer 7

dermatimes

Question 8

shingles herpes zoster

Answer 8

dormant chicken pox virus. when reactivated (stress) virus awakes in dermatome or skin and causes a skin rash

Question 9

poliomyelitis

Answer 9

infection by polio virus that causes inflammation of gray matter and destruction of motor neurons.

Question 10

spinal poliio

Answer 10

asymetric muscle paralysis most typically in the legs. most common form

Question 11

bulbar polio

Answer 11

weakness of muscles innervated by cranial nerves

Question 12

polioencephalitis

Answer 12

infection of the brainstem or higher in the brain

Question 13

Leprosy

Answer 13

disease of peripheral eyes, skin, and upper respiratory tract that can result in sensory and motor deficits
insensitive to fine tough, pain and heat receptors

Question 14

myansthenia gravis

Answer 14

disorder of somatic motor system
progressive weakening of the skeletal muscles
autoimmune disorder
antibodies diminish acetylcholine receptors at motor endplates

Question 15

Neuronal Regneration in PNS

Answer 15

macrophages invade and destroy axon distal to the injury.
axon filaments grow from injured site through a regeneration tube formed by surviving schwann cells
as axon regenerates a new myelin sheath is formed