Card Set Information
History a typical eukaryoti cell
-specializations of nerve cells (neurons)
Which century and does the cell theory apply to the nervours system?
Neurons could not be visualized under microscope until invention of the Golgi stain
-raindomly stains 1% of al cells
-stains the entire cell
-made it possible for first time to see neurons
Ramon y cajal
-used the golgi stain
-proposed neuron doctrine
The Neuron Doctrine
-Proposed by cajal
- neuron doctrine the nervous system is made up of indivdual cells ( like every other tissue in the body) correct
The reticular theory
stating that the nervous system is one continuous network was wrong.
-genes are trnscribed
-Mrna exported out throught pores in nuclear envelope
Rought endoplasmic reticulum
-site of protein synthesis
-Modifications of proteins (addition of carbohydrates, phosphorlation)
-post office packaing labeling, sending of macromolecules to different parts of cell
dendrites is and axon is
site of signal transfer
Electrical signal then chemical signal (neurotransmitter) then electrical signal
smaller volume, reactions at synapse confined.
Dendrite from a mentally retareded infant
-longer thinner falure to establish synaptic circuits
-cells in the nervous system that are not neurons
-3x-10x as many glia as neurons
Myelination glia, CNS? and PNS?
-Schwann cells -pns
they wrap themselves around axons of neurons, insulation, and speeds up signal
-Damage to myelin
different type of glia cell
-fill the space between neurons regulate chemical composition of extra cellular solution
wiring diagrams for every single neuron in a system.
how many neuron connectiong brain and how many muscles for controlling ear movements?
15 neurons in a nerve connecting brain and 2 small muscles controlling ear movements.
200 muscle cells