What are the differences between the dorsal and ventral rami of the spinal cord?
Nerve roots are attached to each segment of the spinal cord.
Those that exit from the posterior lateral sulcus are called the dorsal roots, whereas the ventral roots emerge anterior over a wider area.
Short mixed spinal nerves are formed when a pair of dorsal roots and ventral roots unites beyond the dorsal root ganglion.
This mixed spinal root then divides into the thin dorsal root ramus and the thicker ventral root ramus.
The dorsal root rami are the central processes of the unipolar cells located in the dorsal root ganglion.
These fibers innervate the paraspinal muscles and overlying skin and also carry sensory information.
The ventral root rami are essentially extensions of the anterior horn motor neurons, and innervate the muscles of the cervical, brachial, or lumbosacral plexus.
In addition to motor fibers, the ventral ramus also contains axons originating from sensory and sympathetic ganglia