For the most part the spinal nerves exit the vertebral canal through the intervertebral foramen below their corresponding vertebra. This plexus divides into nerves that carry sensory messages and control the abdominal and legs muscles. Nerve Structures Of The Spine Spinal nerves L1 to L4 combine to form the lumbar plexus. . Dorsal and Ventral Roots. The trigeminal nerve V has sensory and somatic motor functions. Spinal nerves are involved in movement sensation and sweat secretion. 8 cervical 12 thoracic 5 lumbar 5 sacral and 1 coccygeal. Exercises can strengthen the core muscles that support the spine and. The first 4 cervical spinal nerves C1 through C4 split and recombine to produce a variety of nerves that subserve the neck and back of the head. These are the sensory nerves motor nerves and mixed nerves. There are two main types. Functionally the PNS can be divided into the autonomic and somatic nervous...
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