Innervation

8 important questions on Innervation

What are the nerves involved in the innervation of the muscles of the neck?

1. Cranial nerve XI (accessory nerve): Brachiocephalicus, Omotransversarius, Sternocephalicus
2. Spinal nerves: Splenius, longissimus,

What innervates the muscles of mastication?

Cranial nerve V (mandibular): temporalis and masseter (closers), medial pterygoid (rostral)
Cranial nerve VII (facial): medial pterygoid (caudal)

What are the branches of CN VII in the face?

1. Dorsal
2. Ventral
3. Auricopalpebral (from ears to eyes)
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What innervates the facial muscles of expression?

Dorsal and ventral branches of cranial nerve VII (Facial)

What innervates the salivary glands?

The parasympathetic axons in CN VII (facial) or CN IX (glossopharyngeal)

What nerves innervate the nasal cavity?

1. Infraorbital nerve of the trigeminal nerve CN V2: pain, touch, temperature
2. Olfactory nerve CN I: smell

What innervates the teeth?

- Superior alveolar branches of maxillary nerve (CN V2) through infraorbital foramen
- Inferior alveolar branches of mandibular nerve (CN V3) through mental foramina

What innervates the tongue?

1. Hypoglossal nerve (CN XII) motor to all muscles
2. Lingual nerve from
  • Mandibular branch of trigeminal (CN V3) = general sensation to rostral 2/3
  • Facial (CN VII): taste to rostral 2/3
  • Parasympathetic innervation to salivary glands
3. Glossopharyngeal nerve (CN IX): taste and general sensation to caudal 1/3
4. Vagus nerve (CN X): taste to caudal 1/3

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