What are Dendrites?

A dendrite is a short, branched process that protrudes from the neuronal cell body. The number, length, and distribution of dendritic branches vary greatly among different neurons. A dendrite receives impulses from other neurons, so its range of distribution can represent the range of stimulation that that neuron receives. The organelles contained in the dendrites are similar to the neuronal soma. The branches of dendrites have dendritic spines or small dendritic buds that form synapses with other neuron tips.

A dendrite is a short, branched process that protrudes from the neuronal cell body. The number, length, and distribution of dendritic branches vary greatly among different neurons. A dendrite receives impulses from other neurons, so its range of distribution can represent the range of stimulation that that neuron receives. The organelles contained in the dendrites are similar to the neuronal soma. The branches of dendrites have dendritic spines or small dendritic buds that form synapses with other neuron tips.

Chinese name

Dendrite

Foreign name

dendrite

Function

Accepts incoming information from other neurons

Attributes

Cell process

Meaning

Branching

Dendritic Overview

A dendrite is a type of cell process. Cell processes are elongated parts that extend from the cell body and can be divided into dendrites and axons. The branches produced by the extended part of the cell body are called dendrites, and dendrites are the entrance to receive information from other neurons.

The branches produced by the extended part of the cell body are called dendrites, and dendrites are the entrance to receive information from other neurons. Dendrites receive chemicals (transmitters) released from the axon of the previous nerve, which causes the nerve to generate a potential difference to form a current transmission message. Each neuron can have one or more dendrites, which can receive stimulation and pass excitement into the cell body. . Because neurotransmitters exist only in the synaptic vesicles of the presynaptic membrane, they can only be released by the anterior membrane of the synapse and then act on the postsynaptic membrane, so the transmission of excitability between neurons is unidirectional. At the same time, dendrites are not necessarily channels for afferent nerves. It can also be a somatic membrane.

Dendritic structure 2.

1. Dendrite:

A dendrite is one or more protrusions from a neuron. It has a thick start, branches repeatedly, tapers, and becomes dendritic. It is called a dendrite. Its internal structure is similar to that of the periplasm. It contains Nissl bodies, neurofibrils, mitochondria, Golgi complex, and smooth surface endoplasmic reticulum. There are many receptors on the cell membrane outside the dendrite, so the dendrite is the part where the neuron receives the chemical messenger. The axon ends of other neurons finally reach the surface of the dendrite, forming a synapse. The more dendrites and their branches of a neuron, the larger the area that receives impulses, that is, the more synapses that accept chemical messengers. Many small protrusions often extend on the surface of dendrites of some neurons, called dendritic spines. It is the site of synaptic contact with the axon terminals of other neurons, and it has a certain regulating effect on the excitation of neurons. .

The role of dendrites is to receive impulses from other neurons and transmit them to the cell body.

2. Neurons:

A neuron is a highly differentiated cell that functions to sense stimuli and conduct impulses. Its morphology is diverse, but all have protrusions, so neurons can be divided into two parts: cell body and cell process. Cell bodies vary greatly in shape and size, including spherical, pyramidal, pear-shaped, star-shaped, and granular. Small neuron cell bodies are only 4-6 microns in diameter, such as cerebellar granulosa cells. It can be as large as 150 microns, such as large pyramidal cells in the cerebral cortex. The structure of the cell body is similar to that of normal cells, and consists of the cell membrane, cytoplasm, and nucleus. The cell membrane is mostly a typical unit membrane structure, which continues as a membrane on the surface of the protrusion at the cell process, and has a special morphology at the synapse, forming the anterior or posterior membrane of the synapse. The nucleus is generally spherical, located in the center of the cell, with less heterochromatin and obvious nucleoli. The cytoplasm of neurons is also called neural plasm or periplasm, which contains organelles such as mitochondria, Golgi complex, smooth endoplasmic reticulum, centrosome, lysosomes, lipid droplets, microtubules and lipofuscin particles It also contains two components that are unique to nerve cells, namely Nissl bodies and neurofibrils.

Dendritic morphology:

The dendrites protruding from the cytoplasm of nerve cells are called dendrites. The base of the dendrite is relatively wide, and gradually becomes thinner as the protrusion prolongs and repeats branching, from one branch to multiple branches. Normal neuron cell bodies protrude from several main dendrites, but some have only one main dendrite. The dendrites are shorter and the terminal branches are mostly confined to the cell body. The components in the dendrite are the same as those in the cytoplasm, and they also contain Nissl bodies, mitochondria, and neurofibrils. In the Golgi silver plating section, there were many spines on the surface of the dendritic branches, called spines or small buds. These spines are the points of contact between the terminal branches of other neurons and dendrites. The role of dendrites is to receive excitement from other neurons and transfer the excitement to the cell body.