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The rootlets unite to form an anterior (ventral) or posterior (dorsal) root of a spinal nerve. The anterior/ventral root contains efferent nerve fibres, which carry stimuli away from the CNS towards their target structures.
In anatomy and neurology, the ventral root of spinal nerve, anterior root, or motor root[1] is the efferent motor root of a spinal nerve. At its distal end, the ventral root joins with the dorsal root to form a mixed spinal nerve.
One of the two roots that extend from the spinal cord is the ventral root of the spinal nerve, also known as the anterior root of the spinal nerve or the motor root. A spinal nerve's ventral root is created when the rootlets come together.
Each nerve forms from nerve fibers, known as fila radicularia, extending from the posterior (dorsal) and anterior (ventral) roots of the spinal cord. The roots connect via interneurons. Grossly, the root fibers join together within the intervertebral foramina to form a spinal nerve.
The axons emerging from the anterior side do so through the anterior (ventral) nerve root. The posterior and anterior nerve roots fuse together to form the spinal nerves . Figure \(\PageIndex{2}\): Spinal Cord within Vertebra.
The ventral and dorsal nerve roots exiting a cross section of spinal cord fuse together to form a spinal nerve, which then splits into the dorsal and ventral rami. The white and gray ramus form the rami communicantes that connect spinal nerves to autonomic ganglia.
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.