1. neurons – 10 to 100 billion neurons can vary tremendously in size and shape but all have 3 components cell body or soma contains genetic material, provides nutrients, Dendrites Primarily responsible for receiving info from adjacent neurons
neurons – 10 to 100 billion neurons ◦ cell body or soma dendrites axons – Primarily important for conveying info from one neuron to the next
motor neurons ◦ efferent – carry info from CNS sensory neurons ◦ afferent – carry info toward CNS interneurons ◦ carry info within regions
Glial cells provide imp supportive role: ◦ providing nutrients to neurons neurotrophic factors ◦ provide support for neurons myelin sheaths ◦ play a role in response to neuronal injury astrocytes ◦ play a role in brain development radial glia
PNS - peripheral nervous system 2 components 1. autonomic nervous system -“involuntary” -role in emotion and stress controls smooth muscles, cardiac muscles and glands two anatomically separate components
“fight or flight” ◦ activated during emergencies, stress and/or arousal ex.
Importance of the location of injury in spinal cord in understanding the type and extent of damage that a person with spinal cord injury will have dermatome map
Cervical – green Thoracic- blue Lumbar- purple Sacral- red
Importance of the location of injury in spinal cord in understanding the type and extent of damage that a person with spinal cord injury will have A high cervical injury vs a low thoracic injury will result in very different outcome!!!!
Christopher Reeve’s damage was between C1 and C2
-brought to the attention of many the need for research in spinal cord injury - strong advocates of stem cell research -changed our beliefs about spinal cord injury
Touch tongue to your soft palate.tongue ◦ Underside of tongue may be warmer than the top (which probably cooled by the Slurpee you just chugged. Drink something warm Drink Make a mask with your hands to cover your mouth and nose. Breathe quickly, raising the temperature inside your mouth.Breathe quickly Press a warm thumb against your palate. Wait it out.
Swelling or compression of the 7th cranial nerve ◦ causes: ◦ treatment: ◦ recovery:
How is it protected? ◦ Skull obvious - advantages of skull less obvious - disadvantage- closed head injury coup - site of injury contre coup
corpus callosum – sole purpose of the corpus callosum is to serve as a “bridge” between left and right hemispheres ◦ contains millions and millions of axons ◦ allows left and right side of brain to know what each other is doing!