Facial Nerve Flashcards
Roots of Facial Nerve
Motor Root
Sensory (Nervus Intermedius) Root
Nuclei of Facial Nerve
Nucleus of Tractus Solitarius (Medulla)
Motor Nucleus (Pons)
Special Lacrimatory Nucleus (Pons)
Superior Salivatory Nucleus (Pons)
Nuclei of Facial Nerve
Tractus Solitarius function
Afferents for Taste Sensation from Anterior 2/3rd of Tongue
Nuclei of Facial Nerve
Motor Nucleus function
Efferents to Facial Muscles
Nuclei of Facial Nerve
Superior Lacrimatory Nucleus function
Efferents to Lacrimal Gland
Nuclei of Facial Nerve
Superior Salivatory Nucleus function
Efferents to Submandibular Gland
Fill Out - Intracranial Course of Facial Nerve
Intracranial Course
Damage of Facial Nerve at the Genu
Damage to function of:
Greater Superficial Petrosal Nerve (Lacrimation)
Chorda Tympani (Salivation + Taste)
Nerve to Stapedius (Hyperacusis)
Terminal Motor Branches
Intracranial Course
Damage of Facial Nerve at 2nd Bend
Damage to function of:
Chorda Tympani (Salivation + Taste)
Stapedius Nerves (Hyperacusis)
No Damage to Greater Superficial Petrosal Nerves
Fill Out - Extracranial Course of Facial Nerve
What are the Branches of Facial Nerve?
Parasympathetic Efferent Fibers
Motor Efferent Fibers
Taste Fibers
Branches
Parasympathetic Efferent Fibers
Superficial Petrosal Nerve + Facial Canal: Secretory to Lacrimal Gland and Nasal Mucosa
Chorda Tympani: Secretory to Submandibular and Sublingual Glands
Branches
Motor Efferent Fibers functions
Supplies:
Muscles of Facial Expression
Posterior Belly of Digastric
Stylohyoid
Stapedius
Branches
Motor Efferent Fibers branches
Temporal, Zygomatic, Buccal, Mandibular and Cervical Branches
Nerve to Stapedius (Facial Canal)
Digastric Nerve
Stylohyoid Nerve
Posterior Auricular Nerve
Branches
Taste Fibers Functions
Chorda Tympani + Facial Canal: Carry Taste Sensation from Anterior 2/3rd of Tongue and Palate
What are the types of Facial Palsy?
Infranuclear/Lower Motor Neuron Lesion
Supranuclear/Upper Motor Neuron Lesion
Infranuclear Lesion
Symptoms
Facial Asymmetry towards Normal Side
Mask-like face (Wrinkles of Forehead disappear)
Eyes cannot close
Downward Angle of Mouth
Food accumulation in Vestibule
Infranuclear Lesion
Bell’s Palsy causes
Bell’s Palsy is a type of Infranuclear Lesion
Temporary, Unilateral LMNL affecting Facial Nerve at Stylomastoid Foramen
Infranuclear Lesion
Bell’s Palsy symptoms
One-sided face paralysis
Lacrimation, Taste, Salivation and Ear Reflexes are preserved
Supranuclear Lesion
Symptoms
Lower Part of Face Paralysed
Upper Part of Face Weakened
Wrinkles remain and Eyes can be closed
Supranuclear Lesion
Reasons for symptoms
Upper part of Facial Motor Nucleus is Bilaterally Supplied from Cortico-Nuclear Tract
