Signs in Facial Nerve Palsy | Bell's Phenomenon, Crocodile Tears & Tinel's Sign
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Signs in Facial Nerve Palsy
Three classical signs are associated with facial nerve palsy. In this post, we will discuss:
Bell's Phenomenon
Crocodile Tears
Tinel's Sign
Bell's Phenomenon
📌 Type of Sign
👉 Clinical Sign observed on attempted forceful eye closure .
🔍 What is the Sign?
Bell's Phenomenon refers to the upward and outward rolling of the eyeball when the patient forcibly tries to close the eyelids .
Is Bell's Phenomenon a normal or abnormal response of the body? Why?
🩺 How is it Elicited?
The patient is asked to close the eyes tightly .
A positive sign is:
✅ The eyelids fail to close tightly, the eyeballs move upwards and outwards , and the cornea is hidden under the upper lid
What is the mechanism behind Bell's Phenomenon?
👨⚕️ Eponym
Named after Sir Charles Bell , who first described this protective upward movement of the eye during eyelid closure.
⚠️ Important MCQ Trap
Bell's Phenomenon is NOT the same as Bell's Palsy.
Term Meaning Bell's Palsy Idiopathic lower motor neuron paralysis of the facial nerve Bell's Phenomenon Upward rolling of the eyeball on attempted forceful eyelid closure
⭐ Bell's phenomenon is seen in lower motor neuron facial palsy of any cause. Bell's palsy is only one of those causes.
Which is the muscle involved in Bell's Phenomenon?
Crocodile Tears
📌 Type of Sign
👉 Clinical Sign seen during the recovery phase of facial nerve palsy .
What are the other names for Crocodile tears?
🔍 What is the Sign?
Crocodile Tears refers to lacrimation or tearing while eating or chewing , occurring due to misdirected regeneration of facial nerve fibres .
What is the mechanism behind Crocodile Tears?
🐊 Why is it Called Crocodile Tears?
The term refers to a false, insincere display of emotion , such as fake tears of grief.
⭐ Derived from the ancient myth that crocodiles weep to lure their prey or show remorse while eating them .
⚠️ Important MCQ Trap
Feature Gustatory Lacrimation Gustatory Sweating Condition Crocodile Tears Frey's Syndrome Nerve involved Facial nerve Auriculotemporal nerve (branch of Trigeminal nerve) Finding Tearing while eating Sweating over the parotid area while eating
⭐ Both occur during eating .
Tinel's Sign
📌 Type of Sign
👉 Clinical Sign elicited by nerve tapping .
🔍 What is the Sign?
Tinel's Sign is a clinical test to detect irritated or regenerating nerves .
🩺 How is it Elicited?
The examiner lightly percusses or taps over the injured nerve .
A positive sign is:
✅ An intense tingling or pins and needles sensation along the distribution of the nerve, felt distally
👉 A positive Tinel's sign indicates ongoing nerve recovery .
Seen In
Facial nerve regeneration after injury or surgery
Facial nerve reanimation procedures
Peripheral nerve injuries
Carpal tunnel syndrome
⭐ In ENT, it is used mainly in facial nerve regeneration and reanimation surgery .
⭐ The classical non-ENT association is carpal tunnel syndrome .
👨⚕️ Eponym
Named after Jules Tinel , a French neurologist, who described this tingling phenomenon in regenerating nerves.
What is the difference between Tinel's sign & Chvostek's Sign?
What are the signs seen in Hypocalcemia?
⭐ High Yield Rapid Revision Table
Sign Elicited By Finding Significance Bell's Phenomenon Attempted forceful eye closure Upward and outward rolling of the eyeball with failure of eyelid closure Lower motor neuron facial palsy Crocodile Tears Observed during eating or chewing Lacrimation instead of salivation Aberrant regeneration in the recovery phase of facial nerve palsy Tinel's Sign Tapping over the nerve Tingling or pins and needles sensation distally Irritated or regenerating nerve
🧠 Viva Pearls
Bell's phenomenon is upward and outward rolling of the eyeball on attempted forceful eyelid closure.
Bell's phenomenon is not the same as Bell's palsy.
Bell's palsy is idiopathic lower motor neuron paralysis of the facial nerve.
Crocodile tears occurs in the recovery phase of facial nerve palsy, due to misdirected regeneration of parasympathetic fibres.
Gustatory sweating is seen in Frey's syndrome and involves the auriculotemporal nerve.
Tinel's sign is elicited by tapping over an injured nerve, producing distal tingling.
A positive Tinel's sign indicates ongoing nerve recovery.
Tinel's sign is named after Jules Tinel, a French neurologist.
The classical association of Tinel's sign is carpal tunnel syndrome.
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