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You are watching: Which of the following sensory functions involves neurons in the posterior root ganglion?

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Under this heading, we will comment on important functions that the dorsal source ganglion. Together we already know the the dorsal root of the spinal nerve is linked with the sensory functions, every the functions linked with the dorsal root ganglion are also related to various sensations.


The sensation of ache is dubbed nociception. The sensory neurons in the dorsal source ganglion express G protein-coupled receptors very sensitive to protons. They are affiliated in the perception of pain brought about by acids or protons.

Perception of mechanically Stimuli

The endings of the fibers originating indigenous the dorsal source ganglion have actually a number of sensory receptors that space activated by various stimuli. Few of these receptors are ion channels that can be triggered by the compression that the dorsal source ganglion.

When a mechanical stimulus is used to the dorsal root ganglion, it causes the opening of these ion channels. It reasons the late of a compressing force that lasts also after the removal of the mechanically stimulus.

These mechanoreceptors existing in the dorsal source ganglion are split into 2 types; high-threshold (HT) channels and also the low-threshold (LT) channels. These channels have different threshold for activation by press or mechanically stimuli.

Processing of the Sensory Information

The dorsal root ganglion has first-order neurons of sensory fibers. They carry sensations of touch, both crude and fine, heat sensations, sensations of pain, sensation of pressure, and vibration.

The cell bodies in the dorsal source ganglion serve as the an initial relay center and the processing center of this information. If the sensation is an extremely small, it is can not to cause the firing of a large number that nerve fibers. As a result, it usually dies the end at the level the the ganglion and also is not brought to the greater centers that the brain.

Reflex Action

The dorsal root ganglion is an important part that the reflex arc. It forms the sensory eight of the reflex arc compelled to carry out the reflex action. The sensations of pain, pains or temperature is brought through the dorsal root ganglion come the spinal cord.

Destruction of the dorsal source ganglion in any component of the body outcomes in ns of reflex action in that part of the body.

Clinical Significance

The clinical definition of dorsal source ganglion are questioned in this section.

Treatment of Chronic Pain

The gate-control concept of pain has actually revolutionized the therapeutic method for the treatment the chronic pain. The dorsal root ganglion is just one of the targets because that chronic pains management. The approaches used to treat chronic pain with dorsal root ganglion involvement include the following:

continuous stimulation or modulation the dorsal root ganglion by heat or radiofrequency stimuli using pulsed radiofrequency for stimulation that ganglion electrical stimulation that dorsal root ganglion

In enhancement to the above-mentioned stimulation techniques, the cellular attributes of the dorsal root ganglion can additionally be modified by using famous vectors in order to alleviate pain. The gene silencing technique can additionally be offered to alter the moving functions.

If all the above-mentioned approaches fail, the dorsal source ganglion might be gotten rid of as a final resort. This process is well-known as ganglionectomy.

Reservoirs of viral Infections

Some scientific studies have actually proved that the dorsal root ganglia the the spinal cord act as reservoirs of famous infections. This is specifically important in the case of multiple sclerosis.

Other viruses such together varicella-zoster virus and also herpes facility virus can also reside in the dorsal source ganglion. They deserve to remain implicit in the ganglion for quite some time before causing the disease.


The dorsal root ganglion is a arsenal of neuronal cell bodies connected with the sensory source of the spinal nerves. These ganglia are considered to it is in a component of the grey matter of the spinal cord.

The dorsal root ganglia room present an extremely close come the spinal cord. The posterior root expands to type the ganglia as quickly as it pipeline the spinal cord.

The ganglion has cell bodies of pseudo-unipolar neurons. The solitary fiber that emerges native the cell body automatically splits to type an afferent root or dendrite, and an efferent source or axon.

Upon histological examination, the ganglia is watched to have prominent basophilia. Two varieties of cells deserve to be seen; the bigger neurons and also the smaller satellite cells. The satellite cells are seen in the perimeter of the bigger neuronal cells.

The pseudo-unipolar cells in the dorsal source ganglia are obtained from the neural crest cell which an initial appear in the 4th week after ~ fertilization.

The blood supply is obtained from the branches that segmental arteries.

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The attributes of dorsal root ganglia space all associated with the tardy of sensations. These include:

Nociception late of mechanical stimulus ~ above compression first processing center of the sensory information function in reflex activity

The clinical significance of dorsal source ganglion includes the treatment the chronic pain follow to the gate-therapy or via complete resection the the ganglion. The ganglion likewise serves together a source or reservoir of several viruses such together herpes simplex virus.

recommendations Zerboni L, Ku CC, Jones CD, Zehnder JL, Arvin AM. Varicella-zoster virus epidemic of person dorsal root ganglia in vivo.Proc Natl Acad Sci U S A. 2005;102(18):6490–6495. Doi:10.1073/pnas.0501045102
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