Chapter 22: Diseases of the nervous system Lecture NS overview Bacterial diseases Viral diseases Fungal diseases.

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Presentation transcript:

Chapter 22: Diseases of the nervous system Lecture NS overview Bacterial diseases Viral diseases Fungal diseases

The nervous system 2 components: - CNS: brain and spinal cord - PNS: nerves extending from CNS Meningitis- infection of the meninges Encephalitis- infection of the brain Protection via blood-brain barrier

Meninges and cerebrospinal fluid

Etiologies of bacterial meningitis

Neisseria meningitidis, Meningococcal meningitis Symptoms Due to endotoxin Rash that doesn’t fade when pressed Throat infection- bacteriemia- meningitis

Clostridium tetani- tetanus Symptoms Due to tetanospasmin toxin Spastic paralysis

Clostridium botulinum- botulism Symptoms Due to exotoxin (Types A, B, and C) Flaccid paralysis Blurred vision Nausea, no fever

Mycobacterium leprae- Hansern’s Disease or leprosy Symptoms Tuberculoid PNS infected Skin shows immune reactions Lepromatous Skin cells infected Disfiguring nodules Less immune response Tissue necrosis

Polio virus- Poliomyelitis

Rhabdoviridae- rabies Symptoms First stage Mild and varied CNS infected Hydrophobia Mouth/pharyngeal spasms Meningitis/ encephalitis

Transmissible spongiform encephalopathies- Creutzfeldt-Jakob Disease Symptoms Prion disease Loss of motor control Death

Transmissible spongiform encephalopathies- kuru

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