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Related Concept Videos

Peripheral Arterial Disease II: Clinical Manifestations and Diagnostic Evaluation01:21

Peripheral Arterial Disease II: Clinical Manifestations and Diagnostic Evaluation

Clinical manifestationsPeripheral Arterial Disease (PAD) manifests through a range of symptoms, from the characteristic intermittent claudication to atypical presentations and severe complications in advanced stages. Intermittent claudication, a hallmark symptom of PAD, presents as exercise-induced muscle pain that typically resolves within minutes of rest. This pain is reproducible and stems from inadequate blood flow, leading to the accumulation of lactic acid produced during anaerobic...
Ischemic Stroke ll: Pathophysiology01:15

Ischemic Stroke ll: Pathophysiology

An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...
Peripheral Artery Disease I: Introduction01:30

Peripheral Artery Disease I: Introduction

Peripheral artery disease (PAD) predominantly results from atherosclerosis, which involves the accumulation of fatty deposits, or plaques, within the walls of arteries. This causes them to narrow and harden, significantly reducing blood flow. PAD predominantly affects the legs, particularly the arteries supplying the thighs and calves. In rare cases, it may involve other arteries, including those in the arms.Etiology of PAD:The principal cause of PAD is atherosclerosis, which results from fatty...
Somatosensation01:33

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
Secondary Spinal Cord Injury llI: Pathophysiology01:25

Secondary Spinal Cord Injury llI: Pathophysiology

Early Ischemia and Ionic ImbalanceWithin minutes of spinal cord injury, a secondary cascade begins, progressing over hours to weeks. Vascular damage reduces blood flow, causing ischemia and mitochondrial dysfunction. ATP depletion leads to ion pump failure, membrane depolarization, sodium influx, potassium efflux, and water accumulation, resulting in cellular swelling. Increased intracellular calcium further disrupts mitochondria and accelerates cellular injury.Excitotoxicity and Neuronal...
Role of Cerebellum and Prefrontal Cortex in Memory01:14

Role of Cerebellum and Prefrontal Cortex in Memory

The cerebellum, while traditionally associated with motor control, also plays a crucial role in memory, particularly in procedural memory, which involves learning motor tasks that become automatic through repetition. For example, studies have shown that when the cerebellum is damaged, individuals or animals lose the ability to learn conditioned motor responses, such as the conditioned eye-blink response in classical conditioning experiments with rabbits. This study demonstrates the cerebellum's...

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Related Experiment Video

Updated: Jun 24, 2026

Performing Permanent Distal Middle Cerebral with Common Carotid Artery Occlusion in Aged Rats to Study Cortical Ischemia with Sustained Disability
09:11

Performing Permanent Distal Middle Cerebral with Common Carotid Artery Occlusion in Aged Rats to Study Cortical Ischemia with Sustained Disability

Published on: February 23, 2016

Pseudoperipheral palsy due to cortical infarction.

Emma M E Rankin1, Rayessa Rayessa, Sarah L Keir

  • 1Department of Stroke Medicine, Western General Hospital, Edinburgh, Scotland, EH4 2HP, UK.

Age and Ageing
|March 17, 2009
PubMed
Summary

Isolated hand weakness can signal small strokes, not just lower motor neurone lesions. Early identification via MRI is crucial for optimizing secondary stroke prevention strategies.

Area of Science:

  • Neurology
  • Neuroimaging
  • Vascular Neurology

Background:

  • Hand weakness is a common neurological symptom.
  • Differential diagnosis includes lower motor neurone lesions and central nervous system events.
  • Timely diagnosis is essential for effective patient management.

Observation:

  • Two cases presented with isolated hand weakness.
  • Initial clinical assessment suggested lower motor neurone involvement.
  • Magnetic resonance imaging (MRI) revealed strokes as the underlying cause.

Findings:

  • Small cerebral infarcts can manifest as isolated hand weakness.
  • Clinical presentation may be misleading without advanced neuroimaging.
  • MRI is critical for accurate diagnosis of stroke in such cases.

More Related Videos

Permanent Cerebral Vessel Occlusion via Double Ligature and Transection
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Permanent Cerebral Vessel Occlusion via Double Ligature and Transection

Published on: July 21, 2013

Establishment of Acute Pontine Infarction in Rats by Electrical Stimulation
05:02

Establishment of Acute Pontine Infarction in Rats by Electrical Stimulation

Published on: August 27, 2020

Related Experiment Videos

Last Updated: Jun 24, 2026

Performing Permanent Distal Middle Cerebral with Common Carotid Artery Occlusion in Aged Rats to Study Cortical Ischemia with Sustained Disability
09:11

Performing Permanent Distal Middle Cerebral with Common Carotid Artery Occlusion in Aged Rats to Study Cortical Ischemia with Sustained Disability

Published on: February 23, 2016

Permanent Cerebral Vessel Occlusion via Double Ligature and Transection
08:22

Permanent Cerebral Vessel Occlusion via Double Ligature and Transection

Published on: July 21, 2013

Establishment of Acute Pontine Infarction in Rats by Electrical Stimulation
05:02

Establishment of Acute Pontine Infarction in Rats by Electrical Stimulation

Published on: August 27, 2020

Implications:

  • Highlights the importance of considering stroke in isolated hand weakness.
  • Emphasizes the role of MRI in diagnosing subtle strokes.
  • Underscores the need for prompt secondary prevention in stroke patients.