Brain damage and neuroplasticity [in] Pinel J.P., Biopsychology (2018)

Chapter Overview and Learning Objectives (LOs)

  • Brain Damage and Neuroplasticity: Focus on causes and recovery from brain damage to enhance understanding of healthy brain function and treatment advancements.

Learning Objectives

  • LO 10.1: Differences in brain tumors - encapsulated vs. infiltrating tumors.

  • LO 10.2: Types of stroke: cerebral hemorrhage and cerebral ischemia.

  • LO 10.3: Distinguish between contusion, concussion, and contrecoup injury.

  • LO 10.4: Identify types of brain infections.

  • LO 10.5: Describe neurotoxins.

  • LO 10.6: Overview of Down syndrome symptoms and causes.

  • LO 10.7: Differentiate between apoptosis and necrosis.

Causes of Brain Damage

  • Types: Brain tumors, cerebrovascular disorders, closed-head injuries, infections, neurotoxins, genetic factors.

  • Programmed Cell Death: This process mediates various forms of brain damage.

Brain Tumors

  • Definition: Neoplasm - an independent mass of cells.

  • Meningiomas: 20% of brain tumors; encapsulated and generally benign.

  • Infiltrating Tumors: Difficult to remove and usually malignant, like gliomas.

  • Metastatic Tumors: Cancers originating elsewhere that invade the brain.

Cerebrovascular Disorders: Strokes

  • Overview: Fifth leading cause of death, causing significant neurological dysfunction.

  • Types of Stroke:

    • Cerebral Hemorrhage: Rupture of blood vessels causing bleeding and damage.

    • Cerebral Ischemia: Results from thrombosis, embolism, or arteriosclerosis causing reduced blood flow.

Brain Injuries

  • Contusions: Internal bleeding due to vascular damage.

  • Concussions: Temporary disruption of brain function without structural damage.

  • Contrecoup Injuries: Injury occurs on the opposite side of impact.

Infections of the Brain

  • Bacterial Infections: Lead to cerebral abscesses and meningitis; treated with antibiotics but may not reverse damage.

  • Viral Infections: Includes rabies and its effects on the brain which can lead to aggression and transmission through bites.

Neurotoxins

  • Types: Heavy metals (mercury, lead) and drugs that can cause brain damage.

Neurological Diseases

  • Epilepsy: Characterized by recurrent seizures; various causes and types of seizures.

  • Parkinson’s Disease: Movement disorder leading to tremors, rigidity, and cognitive issues; linked to neuronal degeneration in the substantia nigra.

  • Huntington’s Disease: Genetic condition causing motor and cognitive decline; associated with a specific gene mutation.

  • Multiple Sclerosis: Affects myelin with symptoms like ataxia and cognitive changes; influenced by environmental factors.

  • Alzheimer’s Disease: Most common dementia with specific brain pathology including amyloid plaques and neurofibrillary tangles.

Neuroplasticity and Recovery

  • Mechanisms: Includes degeneration, regeneration, and reorganization of neural pathways after damage.

  • Animal Models: Utilized to study human neurological diseases; kindling model for epilepsy, transgenic models for Alzheimer's, MPTP model for Parkinson’s.

Rehabilitation Approaches

  • Techniques: Constraint-induced therapy, physical and cognitive rehabilitation improve outcomes after CNS damage.

  • Neurotransplantation Research: Investigating methods of replacing or supporting damaged neurons.

Key Terms

  • Tumor Types: Meningiomas, gliomas, metastatic tumors.

  • Stroke Types: Cerebral hemorrhage, cerebral ischemia.

  • Neurodegeneration Types: Apoptosis, necrosis, retrograde degeneration.

  • Neurobiology of Disease: Amyloid plaques (Alzheimer’s), Lewy bodies (Parkinson's).

Conclusion

  • The chapter emphasizes understanding brain damage's causes, effects, and recovery mechanisms through neuroplasticity, crucial for advancing treatments and patient rehabilitation.