Trigeminal Nerve (CN V) and Facia Nerve (CN VII)

Question 1

What is the origin of the trigeminal nerve?

Answer 1

Lateral surface of the pons of the midbrain by a motor and sensory root

Question 2

What innervation does the trigeminal nerve provide?

Answer 2

Cutaneous innervation to the face and anterosuperior part of the scalp
Motor innervation to the muscles of mastication

Question 3

What type neurons are found in sensory root of CN V?

Answer 3

Pseudounipolar neurons

Question 4

What type neurons are found in motor root of CN V?

Answer 4

Multipolar neurons

Question 5

Which ganglion is located in the distal end of the sensory root of trigeminal?

Answer 5

Trigeminal ganglion

Question 6

What are the divisions of the trigeminal nerve?

Answer 6

CN Va - Ophthalmic
CN Vb - Maxillary
CN Vc - Mandibular

Question 7

Which of the divisions of the trigeminal nerve are motor and sensory?

Answer 7

CN Va and Vb are solely sensory
CN Vc is largely sensory, but has a motor root

Question 8

What is the origin of the ophthalmic nerve?

Answer 8

It arises from the trigeminal ganglion

Question 9

How does CN Va enter the orbit and exit the cranium?

Answer 9

Superior orbital fissure

Question 10

What are the divisions of the opthalmic nerve?

Answer 10

Frontal nerve
Nasociliary nerve
Lacrimal nerve

Question 11

How does the maxillary nerve leave the cranium?

Answer 11

Foramen rotundum

Question 12

Which ganglion is suspended by the maxillary nerve?

Answer 12

Pterygopalatine ganglion

Question 13

How does the maxillary nerve enter the orbit?

Answer 13

Inferior orbital fissure

Question 14

Where does the zygomatic nerve run after arising from CN Vb?

Answer 14

It continues into the infraorbital groove and foramen as the infraorbital nerve

Question 15

Where does the maxillary nerve supply postganglionic fibres to?

Answer 15

Nasal palate
Palate
Upper alveolar teeth

Question 16

How does the mandibular nerve exit the cranium?

Answer 16

Foramen ovale

Question 17

Which ganglia are suspended by CN Vc?

Answer 17

Otic ganglion - before branching
Submandibular ganglion on its branch

Question 18

What are the branches of the mandibular nerve?

Answer 18

Auriculotemporal nerve
Buccal nerve
Inferior alveolar nerve
Lingual nerve

Question 19

What does the auriculotemporal nerve supply?

Answer 19

Secretomotor fibres from CN IX to the parotid gland
Sensory innervation to the skin of the ear and temporal region

Question 20

What does the lingual nerve provide general sensation to?

Answer 20

Anterior 2/3 of the tongue

Question 21

What does the lingual nerve run between?

Answer 21

Medial pterygoid muscle and mandible

Question 22

Which ganglion is suspended by the lingual nerve?

Answer 22

Submandibular ganglion

Question 23

How does the lingual nerve provide parasympathetic innervation to the submandibular and sublingual glands?

Answer 23

It is joined by the chorda tympani, branch of the facial nerve, at the submandibular gland

Question 24

What does the inferior alveolar nerve supply?

Answer 24

Sensory innervation to the lower teeth

Question 25

In which foramen does the inferior alveolar nerve run?

Answer 25

It runs through the mandibular foramen

Question 26

Where does the facial nerve originate from?

Answer 26

It emerges from the brainstem at the pontomedullary junction

Question 27

What does the facial nerve provide motor innervation to?

Answer 27

Muscles of the face and neck

Question 28

What does the facial nerve provide secretomotor innervation to?

Answer 28

Salivary glands (submandibular and sublingual) Lacrimal glands Mucus glands lining nose Paranasal sinuses Palate Pharynx

Question 29

What does the facial nerve provide special sensory innervation to?

Answer 29

Taste to anterior 2/3 of tongue and a few taste buds in the palate

Question 30

What does the facial nerve provide general sensation to?

Answer 30

Skin of the ear

Question 31

How does the facial nerve enter the skull?

Answer 31

It enters via the internal acoustic meatus

Question 32

Where does the facial nerve fun while inside the skull?

Answer 32

It runs within the facial canal in the petrous part of the facial bone

Question 33

What are the branches of the facial nerve within the facial canal?

Answer 33

Greater petrosal nerve Chorda tympani

Question 34

How does the facial nerve exit the skull?

Answer 34

Through the stylomastoid foramen

Question 35

What are the branches of the facial nerve after exiting the cranium through the STF?

Answer 35

Posterior auricular Nerve to posterior belly of digastric Nerve to stylohyoid Terminal branches

Question 36

What are the terminal branches of the facial nerve?

Answer 36

Temporal branch Zygomatic branch Upper and lower buccal branches Marginal mandibular branch Cervical branch