cranial nerves

Question 1

CN I: Olfactory

Answer 1

• special sense of smell

Question 2

CN II: Optic

Answer 2

• special sense of sight

Question 3

CN III: Oculomotor

Answer 3

• somatic motor to: muscles of eye/eyelid except lateral rectus and superior oblique
• parasympathetic to:
  
  • • sphincter pupillae m of pupil (contraction)
  • • ciliary body of lens

Question 4

CN IV: Trochlear

Answer 4

• somatic motor to superior oblique

Question 5

CN V: Trigeminal

Answer 5

• Somatic sensory from:
  
  • • face
  • • scalp
  • • ear
  • • dura mater
  • • nasal cavity
  • • paranasal sinuses
  • • oral cavity
• somatic motor to:
  
  • • mm of mastication
  • • mylohyoid
  • • anterior belly of digastric
  • • tensor veli palatini
  • • tensor tympani

Question 6

CN VI: Abducent

Answer 6

• somatic motor to lateral rectus

Question 7

CN VII: Facial

Answer 7

• somatic motor to
  
  • • mm of facial expression
  • • auricular mm
  • • posterior belly of digastric
  • • stylohyoid
  • • stapedius
• somatic sensory from
  
  • • skin of auricle and posterior to auricle
• parasympathetic to
  
  • • lacrimal gland
  • • sublingual and submandibular glands

Question 8

CN VIII: Vestibulocochlear

Answer 8

• cochlear
  
  • • special sensory info about hearing from cochlea
• vestibular
  
  • • special sensory info about balance from saccule, utricle and semicircular canals

Question 9

CN IX: Glossopharyngeal

Answer 9

• Somatic sensory from
  
  • • pharynx
  • • middle ear
  • • posterior 1/3 of tongue
• special sensory
  
  • • taste from posterior 1/3 of tongue
• somatic motor to
  
  • • stylopharyngeus
• visceral sensory
  
  • • carotid sinus (baroreceptors)
  • • carotid body (baroreceptors)
• parasympathetic
  
  • • parotid gland

Question 10

CN X: Vagus

Answer 10

• somatic motor to
  
  • • mm of pharynx
  • • mm of larynx
  • • mm of soft palate
• somatic sensory from
  
  • • dura of posterior cranial fossa
  • • pharynx
  • • external acoustic meatus
  • • tongue near epiglottis
• special sensory
  
  • • taste from tongue near epiglottis
• visceral sensory
  
  • • larynx, trachea, esophagus, thoracic and abdominal viscera to L colic flexure
  • • aortic body chemoreceptors and stretch receptors
• parasympathetic
  
  • • thoracic and abdominal viscera to L colic flexure

Question 11

CN XI: Spinal accessory

Answer 11

• somatic motor to
  
  • • SCM
  • • trapezius

Question 12

CN XII: Hypoglossal

Answer 12

• somatic sensory
  
  • • dura of posterior cranial fossa
• somatic motor
  
  • • mm to tongue