Shadowing Practice: Bell palsy - Learn English Speaking with Video
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Bell palsy, named after the Scottish doctor Charles Bell, who first described the condition, is the most common type of facial nerve palsy.
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Facial palsy occurs when there's damage to the facial nerve, also known as the seventh cranial nerve, which results in weakness and paralysis on one side of the face.
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This can happen due to various conditions, including stroke or tumors, but if the underlying cause remains unknown, we call it Bell palsy.
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Remember when you were a kid, and felt crushed because your family was watching a movie instead of your favorite cartoon?
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That grumpy face you made, that's your facial nerve telling your muscles what to do.
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The ultimate control of facial muscles comes from the left
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and right upper motor neurons in the primary motor cortex of the precentral gyrus.
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First, let's talk about the lower right half of the face.
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The upper motor neuron from the left side of the brain travels down to the brainstem, crosses over the midline, and connects to a lower motor neuron in the facial nucleus.
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From here, the lower motor neuron sends signals through the right facial nerve to the lower right half of the face.
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So when it comes to the lower part of your face, each side of your brain handles the opposite lower side.
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But the upper half of the face is like, nah, I want backup in signals from both sides of the brain.
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In this case, the upper motor neuron from the left side of the brain extends to the lower motor neuron on the opposite side.
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But at the same time, the upper motor neuron from the right side sends back up to the lower motor neuron on that same side.
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So when it comes to the upper half of the face, both sides of your brain team up to get the job done.
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Now let's focus on the facial nerve, which emerges from the pontomedullary junction of the brainstem.
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Next, it enters the petrous part of the temporal bone, where it travels through a narrow, Z-shaped canal called the facial canal.
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After passing through the canal, it exits the skull through a small opening in the temporal bone called the stylomastoid foramen.
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From here, the facial nerve passes through the parotid gland, where it branches off to innervate various facial muscles which are responsible for facial expressions.
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The facial nerve also controls the submandibular and sublingual glands, which produce saliva, as well as the lacrimal gland, which creates tears.
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It also carries taste sensations from the front two-thirds of your tongue and innervates the stapedius muscle, which helps reduce the vibrations of the stapes bone against the oval window,
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protecting your hearing from loud noises.
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Now, Bell palsy is also known as idiopathic facial nerve palsy because the underlying cause is unknown.
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However, we know that it involves inflammation of the nerve within the facial canal.
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As the nerve becomes inflamed and swells, it has little room to expand.
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This increases pressure on the small blood vessels supplying the nerve, eventually reducing blood flow and causing nerve ischemia and dysfunction.
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And since small blood vessels are crucial in nourishing the nerve, remember that conditions affecting small blood vessels, like uncontrolled diabetes and hypertension,
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can increase the risk of developing Bell palsy.
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In some individuals, herpes simplex virus type 1 can reactivate from its dormant state in the geniculate ganglion
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and travel along the facial nerve, leading to inflammation.
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This helps explain why this virus is often found in the endoneurial fluid around the affected nerve.
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Now, in Bell palsy, signals from both upper motor neurons are still reaching lower motor neurons.
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But on the affected side, as the signal travels along the facial nerve through the facial canal, it gets blocked.
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In other words, it never reaches facial muscles, causing complete weakness in both the lower and upper halves of the face.
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When the lower part loses innervation, the corner of the mouth droops, which can lead to drooling.
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If the person smiles, the smile looks uneven, and the skinfold running from the side of the nose to the corner of the mouth disappears.
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This is called the loss of the nasolabial fold.
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Finally, puffing out the cheeks is almost impossible, so simple things like blowing up a balloon for a birthday party become a real struggle.
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On the flip side, when the upper half loses innervation, the forehead on that side loses its wrinkles and the person cannot raise their eyebrow.
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The muscles around the eye become weak, making it difficult to fully close the eye.
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When they try, the eye moves upward, which is known as the bell phenomenon.
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And since they can't blink properly, the eye doesn't get the moisture it needs, which can lead to dryness and even corneal ulcers.
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And the story doesn't end with just muscle weakness.
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Since the facial nerve also controls the submandibular and sublingual glands, individuals with bell palsy may experience a dry mouth.
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On top of that, losing sensation from the front two-thirds of the tongue means no taste of their favorite vanilla ice cream.
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And finally, when the stapedius muscle stops working properly, everyday sounds that usually feel fine can suddenly seem unbearably loud.
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This is known as hyperacusis.
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Keep in mind that all these symptoms often start with pain around the ear and usually develop quickly, often within just a few hours.
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Now, to diagnose Bell palsy, the first step is to rule out central causes of facial palsy.
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The main clue is the forehead.
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If a person can still wrinkle the forehead on the weak side, it's likely central facial palsy.
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For example, a tumor, stroke, or multiple sclerosis can affect the upper motor neuron on one side of the brain,
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stopping it from sending signals to the facial nucleus on the opposite side.
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However, the upper motor neuron on the unaffected side still sends backup signals to both facial nuclei, including the one on the affected side of the face.
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This allows the forehead muscles to move.
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But if your patient can't wrinkle the forehead on the weak side, diagnose peripheral facial palsy.
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In this case, both upper motor neurons are sending signals to the facial nuclei, but the signal from the facial nucleus on the affected side is not reaching the facial muscles.
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Next, rule out potential causes of peripheral facial palsy.
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First, acoustic neuroma is a benign tumor of Schwann cells of the vestibulocochlear nerve.
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It usually develops in the pontomedullary angle, close to the facial nerve.
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As it grows, it compresses the facial nerve, causing facial palsy.
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On top of weakness, individuals may experience hearing loss and balance issues.
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Next, mumps infection can trigger paratitis or inflammation of the parotid gland.
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The swollen gland can press on the facial nerve as it passes through, leading to facial palsy.
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Finally, Lyme disease caused by the bacterium Borrelia burgdorferi can result in unilateral or bilateral facial palsy.
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In this case, look for a characteristic rash called erythema migrans and ask about possible tick exposure.
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Once you rule out all these potential causes, you can diagnose Bell palsy.
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Treatment primarily relies on corticosteroids to reduce nerve inflammation and sometimes antiviral medications to fight the herpes simplex virus.
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Alright, as a quick recap, Bell palsy is also known as idiopathic facial nerve palsy because the exact cause remains unknown.
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However, we know that it involves inflammation of the nerve within the facial canal.
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And as the nerve swells, it has little room to expand, which increases pressure on the small blood vessels that nourish it.
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This pressure reduces blood flow, causing nerve ischemia and dysfunction.
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Common symptoms include an inability to wrinkle the forehead or close the eye, loss of the nasolabial fold, and drooping of the mouth on the affected side.
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Thank you.
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Vocabulario y notas de pronunciación para esta lección
Las palabras que más se repiten: facial, nerve, palsy, motor, neuron. Este vídeo tiene 77 frases y 1335 palabras para practicar shadowing. La parte hablada dura 8:04. El hablante habla a un ritmo natural de unas 165 palabras por minuto, cercano a una conversación cotidiana. Solo el 71 % de las palabras está entre las 3.000 más comunes del inglés, por lo que el vocabulario es exigente.
Vocabulario clave de este vídeo
Las 15 palabras más avanzadas del vídeo, con su pronunciación y significado:
| Palabra | Pronunciación | Significado |
|---|---|---|
| palsy sustantivo | /ˈpɔːlzi/ | perlesía |
| neuron sustantivo | /ˈn(j)ʊɹɑn/ | neurona |
| gland sustantivo | /ɡlænd/ | glándula |
| forehead sustantivo | /ˈfɔɹ.hɛd/ | frente, testuz |
| nucleus sustantivo | /ˈnuː.kli.əs/ | núcleo |
| inflammation sustantivo | /ɪnfləˈmeɪ̯ʃən/ | inflamación |
| wrinkle sustantivo | /ˈɹɪŋkl̩/ | arruga f ruga, enruga |
| diagnose verbo | /ˈdaɪ.əɡˌnoʊs/ | diagnosticar |
| osmosis sustantivo | /ɑzˈmoʊ̯sɪs/ | ósmosis |
| swell verbo | /swɛl/ | hincharse, inflarse |
| tumor sustantivo | /tuː.məɹ/ | tumor |
| idiopathic adjetivo | /ˌɪdioʊˈpæθɪk/ | idiopático |
| innervation sustantivo | /ˌɪn.ɚˈveɪ.ʃən/ | inervación |
| ischemia sustantivo | /ɪˈski.mi.ə/ | isquemia |
| nourish verbo | /ˈnʌɹ.ɪʃ/ | nutrir |
Phrasal verbs que vas a escuchar
| Palabra | Significado |
|---|---|
| pass through verbo | atravesar |
| rule out verbo | descartar |
Gramática en este vídeo
Las estructuras que más usa el hablante, con las palabras exactas del vídeo:
| Estructura | En el vídeo |
|---|---|
| Voz pasiva be + participio pasado — importa lo que ocurre, no quién lo hace | is also known · is often found · is called |
| Oraciones de relativo who / which + oración — información extra sobre una persona o cosa | muscles which are · droops, which can · upward, which is |
Pronunciación a tener en cuenta
El hablante usa 4 contracciones y formas reducidas, como can't, doesn't. Dilas en su forma corta, tal como las oyes.
- Los sonidos de “th”: idiopathic /ˌɪdioʊˈpæθɪk/, erythema /ˌɛɹɪˈθiːmə/
- Los sonidos de “sh” y “zh”: inflammation /ɪnfləˈmeɪ̯ʃən/, innervation /ˌɪn.ɚˈveɪ.ʃən/, nourish /ˈnʌɹ.ɪʃ/, dysfunction /dɪsˈfʌŋk.ʃən/, sensation /sɛnˈseɪʃən/
- Palabras largas — cuida el acento: inflammation /ɪnfləˈmeɪ̯ʃən/, idiopathic /ˌɪdioʊˈpæθɪk/, innervation /ˌɪn.ɚˈveɪ.ʃən/, ischemia /ɪˈski.mi.ə/, stapedius /stəˈpi.di.əs/
Sonidos difíciles para hispanohablantes:
- s + consonante al inicio — sin añadir una “e” delante: swell /swɛl/, stapedius /stəˈpi.di.əs/, sclerosis /skləˈɹəʊ.sɪs/, stapes /ˈsteɪ̯piːz/, stylomastoid /ˌstaɪ.loʊˈmæˌstɔɪd/
- /v/ — no es /b/: los dientes tocan el labio inferior: innervate /ɪˈnɝˌveɪt/, innervation /ˌɪn.ɚˈveɪ.ʃən/, antiviral /æntiˈvaɪɹəl/, saliva /səˈlaɪvə/, vestibulocochlear /vɛˌstɪb.jəl.oʊˈkoʊ.kli.ɚ/
- /z/ — sonora, no /s/: palsy /ˈpɔːlzi/, osmosis /ɑzˈmoʊ̯sɪs/, stapes /ˈsteɪ̯piːz/
Cómo practicar con este vídeo
- Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
- Empieza a velocidad 0,75×, haz shadowing frase por frase y vuelve a la velocidad normal cuando te resulte fácil.
- Grábate y compara con el original, prestando atención a palabras como palsy, neuron, gland.
¿Qué es la Técnica de Shadowing?
Shadowing es una técnica de aprendizaje de idiomas respaldada por la ciencia, desarrollada originalmente para la formación de intérpretes profesionales y popularizada por el políglota Dr. Alexander Arguelles. El método es simple pero poderoso: escuchas audio en inglés nativo y lo repites en voz alta de inmediato, como una sombra que sigue al hablante con solo 1-2 segundos de retraso. A diferencia de la escucha pasiva o los ejercicios de gramática, el shadowing obliga a tu cerebro y músculos de la boca a procesar y reproducir simultáneamente patrones de habla reales. Las investigaciones muestran que mejora significativamente la precisión de la pronunciación, la entonación, el ritmo, el habla conectada, la comprensión auditiva y la fluidez al hablar, convirtiéndola en una de las metodologías más efectivas para la preparación del IELTS Speaking y la comunicación en inglés en el mundo real.