D13 - Cranial nerve V2.

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

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

V₂

Answer 5

• V₂ = N. maxillaris
• Sensory innervation​
• Sensory to:
  
  • Lower eyelid
  • Nasal mucosa
  • Upper teeth
  • Upper lid
  • Nose
• Branches:
  
  • N. meningeal ? (→ dura mater)
  • N. zygomaticus (→ skin of temporal and frontal regions)
    
    • ​N. zygomaticofacialis
    • N. zygomaticotemporalis
  • N. infraorbitalis (→ nose, muzzle, upper lid)
    
    • ​Rr. alveolaris
    • Rr. gingivales
    • Rr. dentales
    • Rr. labieles maxillares
    • Rr. nasalis externa
  • N. pterygopalatinus
    
    • ​N. nasalis caudalis (→ ventral nasal conchae, middle meatus)
    • N. palatina minor (→ soft palate)
    • N. palatina major (→ hard palate)