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Histology CNS

Central Nervous System

Afferent somatic nervous system. Signal from sensory neurons going to the CNS.
Efferent somatic nervous system. Signal exiting the CNS going to skeletal muscle.
What are the functions of neurons (nerve cells)? To conduct an action potential.
What cells are responsible for aiding in neuron function? Glial cells (neuroglial), do not conduct action potential.
What are the fundamental structural and functional unit of the nervous system? Neurons
True or False: Plasma membrane of neurons are capable of conducting action potential. True
Types of nueron connections 1) with other neurons 2) effector organs 3) with sensory structures
Structures of the neuron cytoplasmic processes: 1) axons 2) dendrites
Axon hillock show low amount of intracellular cells in immunohistochemistry (less basophilic)
Function of dendrites: increase the surface area for cell to cell contacts
Multipolar neurons most neurons = 1 axon + large # of dendrites
Bipolar neurons 1 axon + 1 dendrite
Location of bipolar neurons retina, vestibulochochlear n., olfactory
psuedo-unipolar neurons 1 axon + 1 dendrite + short cytoplasmic stalk
location of psuedo-unipolar neurons afferent sensory neurons with cell bodies in spinal cord, cranial ganglion
Satellite cells associated with cell bodies, nurture the cell body
Schwann cells associated with nerve fibers
Myelin Sheath during the development tightly wraps axon with schwann cell plasma membrane
What makes up myelin sheaths? Lipid-rich, low ion permeability, and provides insulation
where do unmyelinated axons lie? In simple invagination in schwann cell membrane
Where does depolarization and formation of AP occur on the axon? Node of Ranvier
Saltatory conduction the dancing of action potential down the axon, across the Nodes of Ranvier
Groups of nerve cells in the CNS are called? Nuclei (pl) or nucleus (s)
In the CNS afferent neurons are sensory pseudo-unipolar cell bodies that are surrounded by? Satellite cells like Schwann cells that make a fibrous capsule around the cell body that is continuous with the epineurium.
What are autonomic (visceral) neurons? Preganglionic cell bodies within CNS.
What connections do preganglionic cell bodies form? Connections (synapses) with the postganglionic neurons outside of the CNS.
What type of cells create a discontinuous layer around postganglionic cells? satellite cells
Created by: Jacque1417