Nerve And Blood Supply Oral Cavity

Question 1

Where does oral mucosa receive nociception from

Answer 1

Maxillary and mandibular divisions of trigeminal nerve

Question 2

Innervation of salivary glands

Answer 2

Secretomotor parasympathetic fibres from CN7 for SM and SL, from CN9 for parotid

Question 3

Innervation of teeth and gingivae

Answer 3

Maxillary:
Teeth 1-3: anterior superior alveolar nerve
Teeth 4-6: middle SAN
Teeth 6-8: posterior SAN

Palatal gingiva 1-3: nasopalatine nerve from incisive fossa
Palatal gingiva 3-8: greater palatine nerve from greater palatine foramen

Buccal gingiva 1-3: infraorbital nerve
Buccal gingiva 3-8: buccal nerve

Mandibular:
Teeth 1-3: incisive nerve
Teeth 3-8: infra alveolar nerve

Lingual gingiva: lingual nerve

Buccal gingiva 1-4: mental nerve
Buccal gingiva 4-8: buccal nerve

Question 4

Nociceptive cell bodies location

Answer 4

Ipsilateral trigeminal ganglion projecting to spinal and main sensory nuclei of trigeminal nerve in brain stem

Question 5

Describe venous drainage of face

Answer 5

Veins drain into pterygoid plexus drain into retromandibular vein which splits into anterior and posterior branches to drain into IJV and EJV. Facial vein joins anterior retromandibular vein to drain into IJV

Ophthalmic veins and supraorbital veins drain into cavernous sinus, which communicates with pterygoid plexus. Go to retromandibular or from cavernous go to sigmoid, petrosal etc sinuses to drain into IJV

Question 6

Lymphatic drainage of the oral cavity

Answer 6

Sequential flow: submental lymph to submandibular lymph nodes to upper jugular chain/vein

Tongue go to lower jugular chain.

Question 7

Motor supply to orofacial musculature (cranial nerves)

Answer 7

CN5, 7, 11, 12