Lecture on Cranial Nerves

Introduction

• Presenter: Sarah from Register Nurse RN.com
• Focus: Cranial nerves, their locations, functions, and memory aids
• Suggested follow-up: Take a quiz on the provided website to test knowledge

Overview of Cranial Nerves

• Total of 12 cranial nerves
• Located in the brain
• Each nerve has a specific function

Cranial Nerve Details

1. Olfactory Nerve (CN I)

   • Location: Top, pink area
   • Function: Responsible for smell
   • Memory Aid: "Stinky factory" = smell

2. Optic Nerve (CN II)

   • Location: Green area
   • Function: Responsible for sight
   • Memory Aid: "Optic" = eyes

3. Oculomotor Nerve (CN III)

   • Location: Below the optic nerve
   • Function: Moves eyelids, eyeballs, adjusts pupils and lens

4. Trochlear Nerve (CN IV)

   • Location: Purple area
   • Function: Moves eyeballs

5. Trigeminal Nerve (CN V)

   • Location: Largest nerve
   • Function: Moves facial muscles, chewing, facial expressions

6. Abducens Nerve (CN VI)

   • Function: Moves eyeballs

7. Facial Nerve (CN VII)

   • Function: Produces tears, saliva, taste, facial expressions

8. Vestibulocochlear Nerve (CN VIII)

   • Location: Brown sections
   • Function: Auditory, hearing

9. Glossopharyngeal Nerve (CN IX)

   • Location: Below vestibulocochlear
   • Function: Swallowing, saliva production, taste

10. Vagus Nerve (CN X)

    • Function: Controls peripheral nervous system, smooth muscle of GI tract

11. Accessory Nerve (CN XI)

    • Location: Orangish brown area
    • Function: Moves head, shoulders, assists swallowing

12. Hypoglossal Nerve (CN XII)

    • Location: Purple area on top of the stem
    • Function: Tongue movement, speech, swallowing
    • Memory Aid: "Glossal" = tongue

Mnemonics for Memorization

Order of Cranial Nerves

• Mnemonic: "Old Operators Occasionally Troubleshoot Tricky Abducted Family Veterans Galloping Bentley Across History"
  • Explanation: First two letters of words match cranial nerve initials
    • Old (OL) = Olfactory
    • Operators (OP) = Optic
    • Occasionally (OC) = Oculomotor
    • Troubleshoot (TR) = Trochlear
    • Tricky (TR) = Trigeminal
    • Abducted (AB) = Abducens
    • Family = Facial
    • Veterans = Vestibulocochlear
    • Galloping = Glossopharyngeal
    • Bentley = Vagus
    • Across = Accessory
    • History = Hypoglossal

Sensory, Motor, or Both

• Mnemonic: "Some Say Marry Money But My Brother Says Big Brains Matter More"
  • Explanation: First letter indicates function
    • S = Sensory
    • M = Motor
    • B = Both

Conclusion

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