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Nerve Supply of Head & Neck

Oral Anatomy, Histology & Embryology • NEET MDS Study Guide • AI-Generated Notes

⭐ High-Yield Facts for Exam

  • Trigeminal = main facial sensory nerve.
  • V3 = only division with motor fibres.
  • IAN (V3) = mandibular teeth (IANB).
  • Lingual nerve = anterior 2/3 sensation.
  • Taste anterior 2/3 = chorda tympani (VII).

Nerve Supply of the Head & Neck

Trigeminal Nerve (CN V)

The main sensory nerve of the face with three divisions:

  • V1 Ophthalmic — sensory.
  • V2 Maxillary — sensory (maxillary teeth/midface).
  • V3 Mandibular — sensory + the only division carrying motor fibres (muscles of mastication).

Key Dental Nerves

  • Inferior alveolar nerve (V3) — mandibular teeth; targeted by the IANB.
  • Lingual nerve (V3) — general sensation of the anterior two-thirds of the tongue; carries taste via the chorda tympani (from CN VII).

Exam Tips ⭐

V3 = only division with motor fibres; lingual nerve = anterior 2/3 sensation; taste via chorda tympani (VII).

📝 Practice MCQs — Nerve Supply of Head & Neck

Q1. Which trigeminal division carries motor fibres?
A. V1 ophthalmic
B. V2 maxillary
C. V3 mandibular
D. None
Show Answer
✅ Answer: C
Only V3 (mandibular) carries motor fibres to mastication muscles.
Q2. Taste from the anterior two-thirds of the tongue travels via the:
A. Glossopharyngeal nerve
B. Chorda tympani (facial nerve)
C. Vagus
D. Hypoglossal
Show Answer
✅ Answer: B
Chorda tympani (CN VII) carries anterior tongue taste along the lingual nerve.
Q3. The inferior alveolar nerve is a branch of:
A. V1
B. V2
C. V3
D. CN VII
Show Answer
✅ Answer: C
The IAN arises from the mandibular division (V3).
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