Definition

1. Noun:
   • A sensory nerve root: The dorsal root is one of the two roots (the other being the ventral root) that connect a spinal nerve to the spinal cord. It is located on the posterior (dorsal) side and contains the axons of sensory neurons, which carry nerve impulses from the body to the central nervous system.

Usage Examples

• Noun:
  • The dorsal root carries sensory information such as touch, pain, and temperature to the spinal cord.
  • Damage to the dorsal root can result in a loss of sensation in the corresponding area of the body.
  • The cell bodies of the neurons in the dorsal root are located in the dorsal root ganglion.

Advanced Usage

• "Dorsal root ganglion (DRG)": A cluster of nerve cell bodies (a ganglion) located on the dorsal root. This structure contains the cell bodies of the sensory neurons.
  • The dorsal root ganglion is a common target for studying neuropathic pain.

Variants and Related Words

• Dorsal root ganglion (DRG) (n): The swelling on the dorsal root containing sensory neuron cell bodies.
• Ventral root (n): The counterpart to the dorsal root; it carries motor nerve fibers the spinal cord the muscles.
• Spinal nerve (n): A mixed nerve formed by the union of a dorsal root and a ventral root.
• Sensory neuron (n): A nerve cell that carries impulses from a sense organ toward the central nervous system.

Synonyms

• Posterior root: A direct synonym, using the anatomical term "posterior" instead of "dorsal."
• Sensory root: A functional synonym emphasizing its role in carrying sensory information.

Related Phrases

• Dorsal root entry zone (DREZ): A specific region where the dorsal root fibers enter the spinal cord, sometimes targeted in surgical procedures for pain relief.
  • The DREZ lesioning procedure can help manage severe, localized pain.

Notes on Meaning

• The term "dorsal root" is strictly anatomical and neurological. It refers specifically to the structural component of the peripheral nervous system. It is not used metaphorically or in general language. Its primary and only meaning relates to its function as a conduit for sensory neural signals.

Noun

1. one of the two roots of a spinal nerve that passes dorsally to the spinal cord and that consists of sensory fibers