34 Imaging: Cranial Nerves

Question 1

Olfactory Nerve

• What is notable about this cranial in relation to the thalamus?
• Is this nerve visceral or somatic? Afferent or efferent?
• What is notable about the axons of the bipolar neurons of the nasal mucosa aka the olfactory epithelium?
• Where does it exit the skill?

Answer 1

Question 2

Olfactory Nerve

• Pathway
  
  1. Olfactory Receptor Cells
     
     • Are these 1st, 2nd, or 3rd order neurons?
     • What cells to they project to in the olfactory bulb?
  2. Mitral Cells
     
     • What are these the principal cells of?
     • Are they excitatory or inhibitory?
     • What NT do they use?
     • What tracts do they project to, and where do these projections go?
  3. Primary Olfactory Cortex
     
     • What Brodmann area is this?
     • What part of it overlies the uncus?

Answer 2

Question 3

Olfactory Nerv: Pathology

• Lesions of the pathway
  
  • What are the 2 most common causes of these?
  • What do they cause? Is this an ipsilateral or contralateral pathology?
  • Lesions in which area are associated with olfactory hallucinations?
• Foster Kennedy Syndrome (FKS)
  
  • What are the 3 main manifestations of this?
    
    • Which is a contralateral pathology?
  • What kind of pathology usually causes this syndrome?

Answer 3