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The dorsal root of spinal nerve (or posterior root of spinal nerve or sensory root) [1] is one of two "roots" which emerge from the spinal cord. It emerges directly from the spinal cord, and travels to the dorsal root ganglion. Nerve fibres with the ventral root then combine to form a spinal nerve. The dorsal root transmits sensory information ...
A spinal nerve splits within the intervertebral foramen to form a dorsal ramus and a ventral ramus. The dorsal ramus then turns to course posterior-ward before splitting into a medial branch and a lateral branch. Both these branches provide motor innervation to deep back muscles. In the neck and upper back, the medial branch is also responsible ...
A spinal nerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body. In the human body there are 31 pairs of spinal nerves, one on each side of the vertebral column. [ 1 ][ 2 ] These are grouped into the corresponding cervical, thoracic, lumbar, sacral and coccygeal regions of the spine. [ 1 ]
Spinal nerve forming from grey column. The posterior grey column, also known as the posterior (or dorsal) horn of spinal cord, is subdivided into six layers known as Rexed laminae, based on the type of sensory information sent to each section. [8] Marginal nucleus of spinal cord (lamina I) Substantia gelatinosa of Rolando (lamina II)
The dorsal root ganglion is the "spinal ganglion", following the dorsal root. A dorsal root ganglion (or spinal ganglion; also known as a posterior root ganglion[1]) is a cluster of neurons (a ganglion) in a dorsal root of a spinal nerve. The cell bodies of sensory neurons known as first-order neurons are located in the dorsal root ganglia.
Dorsal column–medial lemniscus pathway. The formation of the spinal nerve from the dorsal and ventral roots. Originating in peripheral sensory receptors, the dorsal column-medial lemniscus pathway transmits fine touch and conscious proprioceptive information to the brain. The dorsal column–medial lemniscus pathway (DCML) (also known as the ...
Posterior ramus syndrome, also referred to as thoracolumbar junction syndrome, Maigne syndrome and dorsal ramus syndrome is caused by the unexplained activation of the primary division of a posterior ramus of a spinal nerve (dorsal ramus of spinal nerve). This nerve irritation causes referred pain in a well described tri-branched pattern.
The spinal cord is a long, thin, tubular structure made up of nervous tissue that extends from the medulla oblongata in the lower brainstem to the lumbar region of the vertebral column (backbone) of vertebrate animals. The center of the spinal cord is hollow and contains a structure called the central canal, which contains cerebrospinal fluid.
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