Dendrites: Structure, Function and Malfunction

Dendrites can be described as a number of highly branching, finger-like tapering processes making up a neuron's cell body, or soma. These processes carry impulses back to the soma.

• Dendrites are a collection of processes close to the cell body that receive information from other neurons via synapses.
• They work in contrast to axons, which are a single, long process that transmits impulses away from the cell body to other neurons.
• Every person has at least 100 billion neurons at birth. 
• While reading, writing, speaking about, practicing something, or listening to something, dendrites sprout from the neurons. 
• Because new dendrites need a lot of practice to develop, they take some time to form.

Read More: Nervous System Diseases

Key Terms: Dendrites, Neurons, Synapses, Impulses, Axon, Nissl bodies, Mitochondria, Organelles, Depression.

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What are Dendrites?

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A neuron's (nerve cell) dendrites are its extracellular extensions, which are where it receives signals (information) from other neurons. Electrochemical signals that is, chemical and electric impulses allow information to be transferred from one neuron to another.

Dendrites

• The information transfer is typically initiated at the dendrites through chemical signals and continues along the neuronal axon as electric impulses. 
• It is then passed on to the following neuron at the synapse, which is the location where the two neurons exchange information through chemical signals. 
• They have specialized proteins that receive, process, and transport the numerous signals that they receive from other neurons to the cell body. 
• Additionally, dendrites have organelles that allow them to vary protein density in response to variations in the frequency of neuronal inputs. 
• Axonal connections (synapses) developed on the surfaces of dendrites allow them to receive messages from neighboring neurons. 
• In the area of the cell body, dendrites typically branch out widely, resembling a tree or bush.
• Nissl bodies, mitochondria, and other organelles are found in the cytoplasm of dendrites. 
• The dendrite gives the other neurons a larger surface area to receive stimuli from the outside world. 
• The shortest fiber that extends from a neuron's cell body is called a dendrite.

Read More: Neural Control and Coordination Important Question

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Structure of Dendrites

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Dendrites measure roughly two millimeters in length and range in number from 5 to 7. 

• The majority of the time, they branch widely and project through the soma. 
• As a result, the dendritic tree, also known as the arborization, usually forms surrounding the neuron.
• Numerous cytoskeletal elements, the Golgi apparatus, ribosomes, and the smooth endoplasmic reticulum are all found in dendrites.
• They are involved in the protein synthesis activity that occurs there during signal transmission.

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Function of Dendrites

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Receiving electrical signals and transmitting them to the soma, or the cell body of the neuron, is the primary role of dendrites. Dendrites have further functions, such as

• Dendrites have a critical function in sexual activity.
• Receiving signals or information from another neuron is the dendrites' primary function. 
• Additionally, dendrites gather all incoming data from axon terminals.
• Dendrites gather information from other neurons and transmit it to the brain. 
• The instructions are then relayed by the brain to other bodily parts so that a reaction can take place. 
• Therefore, dendrites, synapses, soma, axon, and other components of a neuron play an important part in how our body functions on a daily basis.
• Organelles found in dendrites modify protein density in response to variations in the frequency of neural inputs. 
• Dendrites encourage neurons' regular activity as a result, which aids in preventing neurological conditions like epilepsy.
• Dendrites are crucial for psychological processes including memory formation.

Read More: Peripheral Neuropathy

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Dendrites Malfunction

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In the exchange of information between neurons, dendrites are crucial. Therefore, it is not surprising that various nervous system illnesses are linked to dendritic dysfunction. 

• Malfunctions range from abnormal morphology to disturbances in dendritic branching, anomalies in dendritic development, and dysfunctional loss of dendrite branching and dendrite genesis. 
• They also vary in form and severity. All of these have been related to illnesses like schizophrenia, autism, depression, anxiety, Alzheimer's, and Down syndrome, among others.

Read More: Neuroscience

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Things to Remember 

• A neuron's or nerve cell's dendrites as projections that receive informational impulses from other neurons.
• The edge of the neuron contains dendrites, which receive messages from other neurons. 
• Dendrites are typically five to seven in number and have a length of roughly two micrometers. 
• The Golgi apparatus, ribosomes, and smooth endoplasmic reticulum are all components of dendrites. 
• Dendrites are also crucial to psychological processes including memory consolidation.
• The synapse is the place where numerous dendrites that are growing together come into touch. 
• Dendrites gather information from other neurons and transmit it to the brain.