CN V: Trigeminal Nerve

Question 1

From where does it emerge?

Answer 1

ventrolateral pons

Question 2

What are the three divisions of the trigeminal nerve?

Answer 2

• ophthalmic (V1)
• Maxillary (V2)
• Mandibular (V3)

Question 3

What does the ophthalmic (V1) branch give sensation to? (6 things)

Answer 3

• forehead and scalp
• conjunctiva and sclera
• skin over nose
• upper eyelid

Question 4

What does the maxillary (V2) branch give sensation to? (8 things)

Answer 4

• anterior temple
• upper teeth/lip
• paranasal sinuses
• nasopharynx and nasal cavity
• palate
• sides of nose
• middle face

Question 5

What does the mandibular (V3) branch give sensation to? (6 things)

Answer 5

• posterior temple
• lower teeth
• skin over chin, jaw, & lower lip
• anterior 2/3 of tongue (general sensation)
• tempomandibular joint

Question 6

Trigeminal motor innervations (all from mandibular branch (V3))

Answer 6

• 4 muscles of mastication
• 2 suprahyoid muscles
• tensor tympani (middle ear; dampens vibrations)
• tensor veli palatini (palate)

Question 7

4 Muscles of mastication innervated by CN V

Answer 7

• masseter (close)
• temporalis (close)
• medial pterygoid (close)
• lateral pterygoid (open)

Question 8

What muscles make up the mandibular sling?

Answer 8

• masseter

- medial pterygoid

Question 9

2 suprahyoid muscles innervated by CN V

Answer 9

• anterior belly of digastric

- mylohyoid

Question 10

Through what foramen does the mandibular branch (V3) of CN V exit?

Answer 10

foramen ovale

Question 11

Tested?

Answer 11

light touching on face

Question 12

Pathology/disorder

Answer 12

• trouble chewing

- lack of sensation on face

Question 13

Through what foramen does the maxillary branch (V2) of CN V exit?

Answer 13

Foramen rotundum

Question 14

Through what foramen does the ophthalmic branch (V1) of CN V exit?

Answer 14

Superior orbital fissure