The Nerves

Question 1

12 Cranial nerves

Answer 1

CN 1- Olfactory
CN 2- Optic
CN 3- Oculomotor
CN 4- Trochlear
CN 5- Trigeminal
CN 6- Abducens
CN 7- Facial
CN 8- Vestibulocochlear
CN 9- Glossopharyngeal
CN 10- Vagus
CN 11- Accessory
CN 12- Hypoglossal

Question 2

Trigeminal nerve

Answer 2

Largest cranial nerve, mixed sensory and motor nerve, has a semi-lunar shaped ganglion called Gasser’s Ganglion divided into

Gasser’s ganglion
1. Ophthalmic
2. Maxillary
3. Mandibular

Question 3

Dermatomes

Answer 3

Dermatomes are areas of skin on your body that rely on specific nerve connections on your spine

TRIGEMINAL DERMATOMES

• Areas of Cutaneous sensory innervation

1. Anterior
   - C2, C3, C4
   - V1, V2, V3
   -C3, C4
2. Lateral
   - C2, C4, C5
   - V1, V2, V3

Question 4

CN V INNERVATION

Answer 4

Sensory fibres to:
• · Scalp
• · Face
• · Mouth
• · Teeth
• · Nasal Cavity
• · Para-nasal Sinuses

Motor fibres to:
• Muscles of Mastication
• Tensor Tympani
• Tensor Veli Palatine

Question 5

OPHTHALMIC BRANCH V1

Answer 5

• • Entirely sensory
• • Divides into 3 branches which pass through the Superior Orbital fissure

Superior Orbital Fissure:
• Lacrimal
• Frontal
• Nasocilliary (cornea, sclerae, upper anterior part of nasal septum, lateral wall of nose)

I) Frontal nerve
. Supra-orbital nerve
. Supra-trochlear nerve

II) Lacrimal nerve
. Communicating branch connected to Zygomaticotemporal nerve on Maxillary branch
. Cutaneous branch of lacrimal nerve

III) Nasociliary nerve
. Posterior ethmoidal nerve
. Anterior ethmoidal nerve
. Infratrochlear nerve from nasociliary nerve

Question 6

MAXILLARY BRANCH V2

Answer 6

From Pterygopalatine Fossa
• Infra-orbital nerve through Infra-orbital canal
• Zygomatic nerve

Sphenopalatine foramen (nasopalatine)
• Superior alveolar nerves
• Palatine Nerves
• Pharyngeal nerve

Infra-orbital foramen
• Anterior superior alveolar nerve
• Infra-orbital nerve

On the face
• Inferior palpebral nerve
• Superior labial nerve

Question 7

Superior Alveolar Nerves

Answer 7

• Anterior Superior Alveolar Nerve [Canines and incisors]

• Middle Superior Alveolar Nerve
[Premolars and Mesio-buccal root of the first molar (16 and 26)]

• Posterior Superior Alveolar Nerve [Distso-buccal root of 16 and 26
And last Molars (17, 18)]

Question 8

Nerves of the Palate

Answer 8

Nasopalatine nerve
Greaterpalatine nerve
Lesser palatine nerve

Question 9

Mandibular Branch V3

Answer 9

Branches of the Mandibular Nerve include:

Main Trunk:
• Meningeal branch
• Nerve to medial pterygoid

Anterior Division:
• Masseteric nerve
• Deep temporal nerve
• Nerve to lateral pterygoid
• Buccal nerve

Branches from the posterior division of V3

Lingual Nerve
• Innervation to anterior 2/3 of
tongue and lingual soft tissue
Incisive Nerve:
• Provides innervations to lower first
premolar, canines and incisors.

Question 10

V2 and V3

Answer 10

V3
Meningeal branch
Communicating branch

Zygomatic nerve
.Zygomaticotemporal
.Zygomaticofacial

Infraorbital nerve
. Palbebral branch
. Nasal branch
. Labial branch

Anterior superior alveolar nerve
Middle superior alveolar nerve
Posterior superior alveolar nerve

Nasopalatine nerve
Pharyngeal nerve
Greater palatine nerve
Lesser palatine nerve

V2
Nervous spinosus
Auriculotemporal nerve
Inferior alveolar nerve
Mylohyoid nerve
Mental nerve
Lingual nerve