cranial nerves 1

Question 1

what is the name of cranial nerve 1 and what is its target organ

Answer 1

• olfactory nerve

- special sensory [smell]

Question 2

what is the origin and destination of cranial nerve 1

Answer 2

• origin = olfactory epithelium

- destination = olfactory bulb

Question 3

what is the pathway of olfactory nerves

Answer 3

• within the olfactory epithelium there are lots of receptor cells forming bundles which pass through cribriform plate which is part of the ethmoid bone
• ethmoid bone contains lots of holes allowing nerves to pass through
• the afferent fibres synapse in the olfactory bulb
• axons of post synaptic neurone proceed to cerebrum as olfactory tracts

Question 4

what is the ethmoid bone

Answer 4

• bone separating nasal cavity from brain

Question 5

clinical test for cranial nerve 1

Answer 5

• hold strong smelling substance under each nostril