Neuroscience · BEGINNER LESSON
Neurite
A neurite is a branch-like projection of a neuron. In the sources, neurites include axons and dendrites; they carry signals either away from or toward the cell body, called the soma.
What neurites are
A neurite is one of the branch-like projections of a neuron. A neuron is a nerve cell with a cell body, called the soma, and at least one neurite. The two main kinds are axons, which carry signals away from the soma, and dendrites, which carry signals toward the soma.
[1] Physiology, Nerve - StatPearls - NCBI Bookshelf [2] The regulatory landscape of neurite development in ... [3] Neurite, a Finite Difference Large Scale Parallel Program ...
What they do
Neurites help neurons send information through the nervous system and sometimes to other tissues. Their shape and connections let electrical signals travel along the neuron and reach target cells. At the end of a neurite, the signal can be passed to another cell through a synapse, which may be electrical or chemical.
[1] Physiology, Nerve - StatPearls - NCBI Bookshelf [2] The regulatory landscape of neurite development in ...
How signal movement works
Electrical signaling along neurites depends on action potentials, which are brief changes in membrane potential. Membrane potential is the voltage difference across the cell membrane. When enough stimulation opens voltage-gated sodium channels, sodium ions move into the cell and the membrane depolarizes. In myelinated axons, myelin insulates most of the neurite, so action potentials form mainly at gaps called nodes of Ranvier and move quickly from node to node.
How neurites are guided and built
During development, neurites grow, polarize, and extend under control of signaling pathways and cytoskeletal rearrangement. Cell-surface receptors read external cues so projections can find the correct targets. Different neuron types use different gene-expression programs, and neurite branching and pruning help shape the final wiring pattern.
Limits and caveats
Neurite development is not controlled by a single factor. It is a multi-tissue process that needs coordinated gene regulation in more than one tissue. Also, not all animals use the same insulation pattern; for example, some species lack myelin. Computational models of neurites can simulate electrical propagation and mechanical loading, but they are approximations rather than direct observation of living tissue.
[2] The regulatory landscape of neurite development in ... [3] Neurite, a Finite Difference Large Scale Parallel Program ...
SEE THE IDEA
How a neurite helps a neuron communicate
The cell body of the neuron; the starting point for signals entering or leaving the cell.
The projection that carries information; it may be an axon or a dendrite.
Myelin insulates much of some axons, while nodes of Ranvier are gaps where action potentials form.
The junction where a signal is passed to another neuron or cell.
Signals travel from or to the soma along neurites, are shaped by myelin when present, and can be passed onward at synapses.
A neurite is the route a neuron uses to move information between the soma and other cells.
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Sources and further reading
This general lesson was generated from public source material. It explains a concept; it does not interpret a private paper or provide medical advice.