D12 - Cranial nerve V1.

Question 1

Name the cranial nerve V.

Answer 1

N. trigemini

Question 2

Give the role of cranial nerve V.

Answer 2

• Mixed type:
  
  • Largest sensory nerve of the head
  • Motor nerve to:
    
    • Masticatory muscles
    • M. mylohyoideus
    • M. digastricus
    • Soft palate muscles
  • Sympathetic ??

Question 3

Give the main division of cranial nerve V. and their pathway out of the skull

Answer 3

• As the nerve leaves the ggl. trigemini it divides into three main branches:
  
  1. N. opthalmichi (V₁) → fissura orbitalis
  2. N. maxillaris (V₂) → for. rotundum
  3. N. mandibularis (V₃) → for. ovale

Question 4

Where are the nucleus of cranial nerve V. located?

Answer 4

• Trigeminal motor nucleus:
  
  • ​Metencephalon
• Trigeminal sensory nucleus:
  
  • ​Mesencephalon
  • Pons
  • Spine

Question 5

V₁

1. Give the branches of V₁
2. Draw V₁

Answer 5

• V₁ = N. opthalmichi
• Sensory innervation
• Runs in a common sheath with III, IV and VI cranial nerves → leaves the cranial cavity and enters the fissura orbitalis
• Branches:
  
  • N. frontalis (→ upper lid, nasal canthus, forehead)
    
    • ​N. supratrochlearis
    • N. supraorbitalis
    • N. sinum frontalium (nb eq?)
  • N. lacrimalis (→ lacrimal gland, temporal canthus)
    
    • R. zygomaticum
    • R. cornualis
    • R. palpebralis
    • R. glandularis
  • N. nasociliares
    
    • ​Nn. ciliaris longus
    • N. infratrochlearis (→ conjuctiva, third eyelid)
    • N. ethmoidales (→ olfactory mucosa)
      
      • N. naso dorsale
      • N. naso laterale