1. spinal cord and hence lower motor neurons

1. “All things are created twice; first mentally; then
physically.”-Stephen Covey, 7 Habits of Highly Effective People

 

The simple flow of
movement typing the answers for this exam requires the coordination of the thinking process which is the role of the
upper motor neuron and the execution
process, the role of the lower motor neuron. The thinking process occurs in
the cortex of the cerebrum, the home of the upper motor neurons which journeys
down to the spinal cord. Lower motor neurons act as the signal conduit between the upper motor
neurons and the skeletal muscles to be innervated.  The
upper and lower motor neuron are linked with interneurons in the spinal cord
and hence lower motor neurons originate in this region and extend to the
muscle.

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2. Astrocytes
are multi-taskers as they perform diverse roles from logistical support thru
the shipment of nutrients, juggling the correct ion concentration and
reconstruction during neuronal damage. Due to the core function of astrocyte
with repair and maintenance, reactive astrongliosis as response to injury and
infection is a hallmark feature of CNS disturbance.

 

Microglia is the devourer of plaques, injured  neurons and synapses and pathogens in the central nervous system.

 The antipodal extremes of low activity (Autism) to over activity (Alzheimer’s)
produces pathological effects.

 

Oligodendrocytes produces myelin
sheath to cover axons as insulation in the central nervous system. Lack of
myelination occurs when oligodendrocytes die, and unmyelinated neurons cannot
function properly as seen in multiple sclerosis

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