Trigeminal Nerve

Question 1

Describe the course of the trigeminal nerve

Answer 1

Pons, trigeminal ganglion forms in trigeminal cave, divides into ophthalmic, maxillary, mandibular

Question 2

Which three foramen do the three divisions pass through?

Answer 2

V1- SOF
V2- Formanen rotundum
V3- Foramen ovale

“Standing Room Only”

Question 3

What are the three branches of V1?

Answer 3

Frontal, lacrimal, nasociliary

Question 4

What does the ophthalmic branch innervate? Parasymp?

Answer 4

Forehead and scalp
Upper eyelid and its conjunctiva
Frontal and ethmoidal sinuses
Cornea
Dorsum of nose
PARASYMP to lacrimal gland

Question 5

What are the afferent and efferent limbs of the corneal reflex?

Answer 5

Afferent- ophthalmic

Efferent- facial, leads to contraction of obicularis occuli

Question 6

What does the maxillary branch innervate? Parasymp?

Answer 6

Lower eyelid and its conjunctiva
Nasal cavity and lat nose
Cheeks and maxillary sinus
Upper lip and sup palate
Upper incisors, canines and molars
PARASYMP- lacrimal and nasal glands

Question 7

What are the 4 branches of the mandibular nerve? Where do they arise?

Answer 7

Buccal
Inf alveolar
Lingual
Auriculotempral

In infra temporal fossa

Question 8

What sensory stuff does the mandibular nerve innervate?

Answer 8

Mucous membranes and oral cavity floor
External ear
Lower lip and chin
Lower molars, incisors, canines
Ant 2/3 tongue GENERAL

Question 9

What motor stuff does the mandibular nerve innervate? And parasymp?

Answer 9

Muscles of mastication
Ant belly digastric and mylohyoid
Tensor tympani and tensor veli palatani

Submandibular, sublingual, parotid- PARASYMP

Question 10

Which derivatives of PA etc do the three branches innervate?

Answer 10

V1- frontonasal prominence
V2- maxillary province and 1st PA
V3- mandibular prominence and 1st PA