Facial Nerve

Question 1

Roots of Facial Nerve

Answer 1

Motor Root
Sensory (Nervus Intermedius) Root

Question 2

Nuclei of Facial Nerve

Answer 2

Nucleus of Tractus Solitarius (Medulla)
Motor Nucleus (Pons)
Special Lacrimatory Nucleus (Pons)
Superior Salivatory Nucleus (Pons)

Question 3

Nuclei of Facial Nerve
Tractus Solitarius function

Answer 3

Afferents for Taste Sensation from Anterior ²/₃rd of Tongue

Question 4

Nuclei of Facial Nerve
Motor Nucleus function

Answer 4

Efferents to Facial Muscles

Question 5

Nuclei of Facial Nerve
Superior Lacrimatory Nucleus function

Answer 5

Efferents to Lacrimal Gland

Question 6

Nuclei of Facial Nerve
Superior Salivatory Nucleus function

Answer 6

Efferents to Submandibular Gland

Question 7

Fill Out - Intracranial Course of Facial Nerve

Answer 7

Question 8

Intracranial Course
Damage of Facial Nerve at the Genu

Answer 8

Damage to function of:
Greater Superficial Petrosal Nerve (Lacrimation)
Chorda Tympani (Salivation + Taste)
Nerve to Stapedius (Hyperacusis)
Terminal Motor Branches

Question 9

Intracranial Course
Damage of Facial Nerve at 2nd Bend

Answer 9

Damage to function of:
Chorda Tympani (Salivation + Taste)
Stapedius Nerves (Hyperacusis)
No Damage to Greater Superficial Petrosal Nerves

Question 10

Fill Out - Extracranial Course of Facial Nerve

Answer 10

Question 11

What are the Branches of Facial Nerve?

Answer 11

Parasympathetic Efferent Fibers
Motor Efferent Fibers
Taste Fibers

Question 12

Branches
Parasympathetic Efferent Fibers

Answer 12

Superficial Petrosal Nerve + Facial Canal: Secretory to Lacrimal Gland and Nasal Mucosa
Chorda Tympani: Secretory to Submandibular and Sublingual Glands

Question 13

Branches
Motor Efferent Fibers functions

Answer 13

Supplies:
Muscles of Facial Expression
Posterior Belly of Digastric
Stylohyoid
Stapedius

Question 14

Branches
Motor Efferent Fibers branches

Answer 14

Temporal, Zygomatic, Buccal, Mandibular and Cervical Branches
Nerve to Stapedius (Facial Canal)
Digastric Nerve
Stylohyoid Nerve
Posterior Auricular Nerve

Question 15

Branches
Taste Fibers Functions

Answer 15

Chorda Tympani + Facial Canal: Carry Taste Sensation from Anterior ²/₃rd of Tongue and Palate

Question 16

What are the types of Facial Palsy?

Answer 16

Infranuclear/Lower Motor Neuron Lesion
Supranuclear/Upper Motor Neuron Lesion

Question 17

Infranuclear Lesion
Symptoms

Answer 17

Facial Asymmetry towards Normal Side
Mask-like face (Wrinkles of Forehead disappear)
Eyes cannot close
Downward Angle of Mouth
Food accumulation in Vestibule

Question 18

Infranuclear Lesion
Bell’s Palsy causes

Bell’s Palsy is a type of Infranuclear Lesion

Answer 18

Temporary, Unilateral LMNL affecting Facial Nerve at Stylomastoid Foramen

Question 19

Infranuclear Lesion
Bell’s Palsy symptoms

Answer 19

One-sided face paralysis
Lacrimation, Taste, Salivation and Ear Reflexes are preserved

Question 20

Supranuclear Lesion
Symptoms

Answer 20

Lower Part of Face Paralysed
Upper Part of Face Weakened
Wrinkles remain and Eyes can be closed

Question 21

Supranuclear Lesion
Reasons for symptoms

Answer 21

Upper part of Facial Motor Nucleus is Bilaterally Supplied from Cortico-Nuclear Tract