Examples of dorsal root in the following topics:
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- Axons of these sensory neurons travel into the spinal cord via the dorsal roots.
- The dorsal root ganglia lie along the vertebral column by the spine.
- The dorsal root ganglia develops in the embryo from neural crest cells, not the neural tube.
- The axons of dorsal root ganglion neurons are known as afferents.
- Dorsal roots and ventral roots come together and exit the intervertebral foramina as they become spinal nerves.
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- The dorsal root ganglia lie along the vertebral column by the spine and develop in the embryo from neural crest cells, not neural tube.
- A dorsal root ganglion (or spinal ganglion) is a nodule on a dorsal root of the spine that contains cell bodies of nerve cells (neurons) that carry signals from sensory organs towards the appropriate integration center.
- The axons of dorsal root ganglion neurons are known as afferents.
- Unlike the majority of neurons found in the central nervous system, an action potential in dorsal root ganglion neuron may initiate in the distal process in the periphery, bypass the cell body, and continue to propagate along the proximal process until reaching the synaptic terminal in the dorsal horn of the spinal cord.
- The nerve endings of dorsal root ganglion neurons have a variety of sensory receptors that are activated by mechanical, thermal, chemical, and noxious stimuli.
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- The somatosensory pathway is composed of three neurons located in the dorsal root ganglion, the spinal cord, and the thalamus.
- The first always has its cell body in the dorsal root ganglion of the spinal nerve.
- This is the target for neurons of the dorsal column–medial lemniscal pathway and the ventral spinothalamic pathway.
- Sensory nerves of a dorsal root ganglion are depicted entering the spinal cord.
- The formation of the spinal nerve from the dorsal and ventral roots.
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- The ventral and dorsal spinocerebellar tracts convey proprioceptive information from the body to the cerebellum.
- It is part of the somatosensory system and runs in parallel with the dorsal spinocerebellar tract.
- The dorsal spinocerebellar tract does not decussate, or cross sides, at all through its path.
- The axon runs via the fila radicularia (nerve rootlets) to the dorsal horn of the gray matter.
- Proprioceptive information is taken to the spinal cord via central processes of the dorsal root ganglia (where first order neurons reside).
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- The trigeminal ganglion is analogous to the dorsal root ganglia of the spinal cord, which contain the cell bodies of incoming sensory fibers from the rest of the body.
- From the trigeminal ganglion, a single large sensory root enters the brainstem at the level of the pons.
- Immediately adjacent to the sensory root, a smaller motor root emerges from the pons at the same level.
- Schematic illustration of the trigeminal nerve (labeled Sensory root above) and the structures it innervates in the face and mouth.
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- Somatosensory organization is divided into the dorsal column–medial lemniscus tract (the touch/proprioception/vibration sensory pathway) and the anterolateral system, or ALS (the pain/temperature sensory pathway).
- In both pathways, primary sensory neuron cell bodies are found in the dorsal root ganglia, and their central axons project into the spinal cord.
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- Each spinal nerve is formed by the combination of nerve fibers from the dorsal and ventral roots of the spinal cord.
- The dorsal roots carry afferent sensory axons, while the ventral roots carry efferent motor axons.
- The dorsal ramus contains nerves that serve the dorsal portions of the trunk; it carries visceral motor, somatic motor, and somatic sensory information to and from the skin and muscles of the back (epaxial muscles).
- Its anterior root helps form the coccygeal
plexus.
- Spinal nerves arise from a combination of nerve fibers from the dorsal and ventral roots of the spinal cord.
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- At the dorsal end of the neural tube, BMPs are responsible for neuronal patterning.
- A secondary signaling center is then established in the roof plate, the dorsal most structure of the neural tube.
- Researchers observed changes in dorsal-ventral patterning; for example zebrafish deficient in certain BMPs showed a loss of dorsal sensory neurons and an expansion of interneurons.
- Shown is the dorsal root ganglion (green ellipsoid regions where cells express neurofilament) and the ventricular zone (red region where cells proliferate) as well as the neural tube with roof and floor plate.
- Chick embryo of thirty-three hours' incubation, viewed from the dorsal aspect (30x magnification).
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- Sciatica is a set of symptoms including pain that may be caused by general compression or irritation of one of five spinal nerve roots that give rise to each sciatic nerve, or by compression or irritation of the left or right or both sciatic nerves .
- Sciatica is a set of symptoms rather than a diagnosis for what is irritating the root of the nerve, causing the pain.
- Sciatica is also referred to as lumbar radiculopathy, which involves compression of the sciatic nerve roots caused by a herniated (torn) or protruding disc in the lower back.
- When sciatica is caused by compression of a dorsal nerve root (radix), it is considered a lumbar radiculopathy (or radiculitis when accompanied with an inflammatory response).
- Sciatica due to compression of a nerve root is one of the most common forms of radiculopathy.
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- The human arterial system originates from the aortic arches and from the dorsal aortae starting from week 4 of embryonic life.
- They are ventral to the dorsal aorta and arise from the aortic sac.
- The common stem of the infraorbital and mandibular branches passes between the two roots of the auriculotemporal nerve and becomes the middle meningeal artery.
- The dorsal aortae are initially bilateral and then fuse to form the definitive dorsal aorta.
- Occasionally, the entire right
dorsal aorta abnormally persists and the left dorsal aorta regresses.