What is the dorsal root ganglion of the spinal cord?
a cluster of cell bodies in the dorsal root of a spinal nerve. The dorsal root ganglia contain cell bodies for sensory nerves that carry sensory information to the spinal cord.
What is the function of dorsal root ganglion of the spinal cord?
As the dorsal root emerges from the intervertebral neural foramina, it forms the dorsal root ganglion (DRG). The DRG is a group of cell bodies responsible for the transmission of sensory messages from receptors such as thermoreceptors, nociceptors, proprioceptors, and chemoreceptors, to the CNS for a response.
What makes up the dorsal root ganglia?
The dorsal root ganglion contains the cell bodies of sensory neurons that bring information from the periphery to the spinal cord. Fibers heading toward the periphery leave the ganglion through the spinal nerve, where they run together with motor fibers. Fibers leading to the spinal cord travel through the dorsal root.
What is found in the dorsal root of the spinal cord?
ganglia structure The dorsal root ganglia contain the cell bodies of afferent nerve fibres (those carrying impulses toward the central nervous system); efferent neurons (carrying motor impulses away from the central nervous system) are present in the ventral root ganglia.
What are dorsal roots?
Definition of dorsal root : the one of the two roots of a spinal nerve that passes dorsally to the spinal cord and consists of sensory fibers.
Where is dorsal root ganglion?
As the name indicates, the dorsal root ganglion is associated with the posterior or dorsal root of the spinal nerve. It is located in close proximity to the spinal cord. As the dorsal root of spinal nerve emerges from the intervertebral neural foramen, it expands to form the ganglion.
What happens when the dorsal root ganglion is damaged?
Damage to the dorsal root ganglion cells leads to simultaneous degeneration of short (non- length dependent) as well as long (length dependent) axons and it is this feature that is the key to understanding the clinical pre- sentation.
Where are the dorsal root ganglion?
Location. The dorsal root ganglia lie in the intervertebral foramina. The anterior and posterior spinal nerve roots join just beyond (lateral) to the location of the dorsal root ganglion.
What does the dorsal root and ventral root of the spinal cord do?
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.
What does the dorsal root contain?
Dorsal roots contain sensory axons which carry signals into the CNS. Ventral roots contains motor axons which carry signals from CNS-originating neurons to muscles and glands (Figure 17.1).
What does the dorsal root consist of?
The dorsal roots contain primary afferent fibers from the skin, subcutaneous and deep tissues, and viscera. Each dorsal root fiber is the central process of a dorsal root ganglion cell. It is estimated that there are 2–2.5 million afferent fibers in human adult dorsal roots on each side (Schoenen and Grant, 2004).
Where is the dorsal root ganglia?