Neuroanatomy: Lemniscus Pathways

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Questions and Answers

The Lateral Lemniscus is part of which pathway?

  • Visual
  • Sensory
  • Auditory (correct)
  • Motor

Damage to the Lateral Lemniscus results in what type of hearing loss?

Contralateral

Damage to the Spinal Lemniscus results in which of the following?

  • Loss of conscious proprioception
  • Loss of pain and temperature from the face
  • Hearing Loss
  • Loss of pain and temperature from the body (correct)

Damage to the Trigeminal Lemniscus results in which of the following?

<p>Loss of pain and temperature from the face (D)</p>
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Which of the following is associated with Benedict's Syndrome?

<p>All of the above (D)</p>
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Which of the following is associated with Weber's Syndrome?

<p>All of the above (D)</p>
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Which cranial nerve is affected in Millard Gubler's Syndrome, leading to medial squint?

<p>VI nerve (A)</p>
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Which cranial nerve is affected in Ponto Cerebellar Angle Syndrome, leading to facial paralysis?

<p>VIIth nerve (D)</p>
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Which cranial nerve is affected in Ponto Cerebellar Angle Syndrome, leading to progressive deafness?

<p>VIIIth nerve (D)</p>
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Flashcards

Lateral Lemniscus

Auditory pathway responsible for C/L hearing loss.

Spinal Lemniscus

Pathway that leads to C/L loss of pain and temperature from the body.

Trigeminal Lemniscus

Pathway causing C/L loss of pain and temperature from the face.

Medial Lemniscus

Pathway for loss of conscious proprioception, touch, vibration, pressure, and stereognosis.

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Benedict's Syndrome

Syndrome with C/L loss of proprioception, touch, pain and temperature, along with III nerve symptoms.

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Weber's Syndrome

Syndrome featuring III nerve symptoms and C/L hemiplegia and facial paralysis.

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Millard Gubler's Syndrome

Syndrome with I/L medial squint, facial paralysis, and C/L hemiplegia.

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Ponto Cerebellar Angle Syndrome

Syndrome with I/L facial paralysis, progressive deafness, and ataxia.

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C/L Hearing Loss

Hearing loss experienced on the opposite side of an injury.

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C/L Loss of Pain

Loss of pain sensation on the opposite side of the injury.

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C/L Loss of Temperature

Temperature sensation loss in body or face inversely related to the injury.

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Conscious Proprioception

Awareness of body position, affected in certain neurological syndromes.

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Ptosis

Drooping of the eyelid due to III nerve damage.

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Divergent Squint

Misalignment of eyes often related to III nerve impairments.

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Light Reflex Loss

Inability to react to light due to nerve damage.

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Accommodation Reflex Loss

Inability to focus on near or distant objects due to neuronal issues.

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C/L Hemiplegia

Paralysis affecting one side of the body opposite to the causative lesion.

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I/L Facial Paralysis

Facial muscle weakness on the same side as the injury.

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I/L Ataxia

Loss of coordination on the same side as the injury, often linked to cerebellar damage.

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Study Notes

Lateral Lemniscus Pathway

  • Damage to the lateral lemniscus results in contralateral hearing loss.

Spinal Lemniscus

  • Damage to the spinal lemniscus results in contralateral loss of pain and temperature sensation from the body.

Trigeminal Lemniscus

  • Damage to the trigeminal lemniscus results in contralateral loss of pain and temperature sensation from the face.

Medial Lemniscus

  • Damage to the medial lemniscus results in contralateral loss of conscious proprioception, touch, vibration, and stereognosis.

Benedict's Syndrome

  • Contralateral loss of conscious proprioception, touch, vibration, and stereognosis.
  • Contralateral loss of pain and temperature sensation from the body.
  • Contralateral loss of pain and temperature sensation from the face.
  • The third cranial nerve is affected resulting in ptosis, a divergent squint, and loss of light and accommodation reflex.

Weber's Syndrome

  • Ipsilateral third cranial nerve palsy (ptosis, divergent squint, loss of light and accommodation reflex).
  • Contralateral hemiplegia (paralysis of one side of the body).
  • The upper motor neuron (UMN) of the eighth cranial nerve is affected leading to paralysis of the lower face.

Millard-Gubler Syndrome

  • Sixth cranial nerve palsy (medial squint).
  • Eighth cranial nerve palsy (facial paralysis).
  • Contralateral pyramidal tract involvement (hemiplegia).
  • Abducent (6th) nerve and pyramidal tract are involved.

Pontocerebellar Angle Syndrome

  • Seventh cranial nerve involvement (facial paralysis).
  • Eighth cranial nerve involvement (progressive deafness).
  • Cerebellar involvement (ataxia).
  • Vestibular nuclei involvement (occipital headache due to ICP).

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