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Motor Neuron
By Katelynn Morris
Structures of the Motor Neuron
• Cell body (biosynthetic center)
• Nucleus
• Nucleolus
• Nissl bodies is used to localize the perikaryon
• Axon hillock
• Axon (impulse generating and conducting
region)
Structures continued
• Neurilemma (sheath of schwann)
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Impulse direction
Schwann cell (one internode)
Node of ranvier
Telodendria (terminal branches)
Axonal terminal
Functions of the Motor Neuron
• The cell body delivers signals from other
parts of the organism.
• The nucleus are organized as DNA
molecules with a large variety of proteins
to form chromosomes.
• The nucleolus is located in the nucleus
and makes Ribosomal RNA.
• Nissl bodies are used to localize the
perikaryon.
Functions of the Motor Neuron
• Axon hillock is part of the neuron that connects
the cell body to the axon.
• the axon conducts electrical impulses away
from the neuron's cell body.
• Neurilemma surrounds the axon of the neuron and
forms the outermost layer of the nerve fiber.
• Impulse direction can only go one direction and
it sends the impulse from one neuron to another.
Functions of the Motor Neuron
• Schwann cell are the supporting cells of the
PNS, they wrap themselves around nerve
axons.
• Node of ranvier are the gaps formed between
the schwann cell generated by different cells.
• Telodendria is the terminal branches of an axon;
makes contact with other neurons at synapsesa neural junction used for communication
between neurons.
• Axonal terminal conducts electrical impulses
away from the neuron's cell body to transmit
those impulses to other neurons.
Osmosis
• Osmosis is the diffusion of water through a semipermeable membrane.
• When materials move into and out of a cell at equal
rates, the cell is balanced, or in dynamic equilibrium. An
isotonic solution has a concentration of materials the
same as the inside of a cell. If a cell is placed in an
isotonic solution, molecules will still move into and out of
the cell, but the cell will be in dynamic equilibrium. If a
substance is in lower concentration outside a cell than
inside the cell, the substance will leave the cell through
osmosis.
Diffusion
• Diffusion is the process where molecules
spread from areas of high concentration,
to areas of low concentration.
• All molecules and particles that are in an
area of higher concentration in a gas or
liquid will tend to move to an area of lower
concentration.
Cellular Respiration
• Cellular respiration is the process of
oxidizing food molecules, like glucose, to
carbon dioxide and water. The energy
released is trapped in the form of ATP ( a
nucleotide that performs many roles in the
cell.) for use by all energy.