Lecture 3 - Lecture 3 Spinal Cord Generic Neuron Input...

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Lecture 3 Spinal Cord
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Generic Neuron 2 Information flow Input from: another neuron sensory cell environmental stimulus Output to: another neuron muscle cell gland cell
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4
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Nissl Stain: Cell Bodies Myelin Stain: Axons
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Cross-section of Spinal Cord Myelin Stain Posterior or Dorsal Anterior or Ventral Lateral
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7 Spinal Cord & Spinal Nerves
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8 Afferent neurons carry information from body to brain Efferent neurons carry information from the brain to the body
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Ventral Root Dorsal Root Spinal Nerve Dorsal Root Ganglion Dura Arachnoid Subarachnoid Pia Ventral Root: Motor Neuron axons to muscles Dorsal Root: Sensory Neuron axons to brain Dorsal Root Ganglion: Sensory Neuron cell bodies
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11 Dermatomes
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13 Spinal Stenosis
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Shingles Symptoms: A discrete area of the skin, usually just on one side of the body develops - Burning or stabbing pain - Hypersensitivity - Inflammation, blistering, scaling
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Shingles often affects a single dermatome
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Shingles is caused by the chicken pox virus (Herpes zoster)
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Now most children are vaccinated with the virus, with the hope that they won’t get chicken pox or shingles.
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- Shingles virus survives dormant for years in sensory neurons of spinal nerves - The virus in a particular spinal nerve can be reactivated by stress or
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Lecture 3 - Lecture 3 Spinal Cord Generic Neuron Input...

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