Fever blisters (or cold sores) are painful sores, which occur on lips, cheeks, chin, fingers, nostrils, or even genitals. These are caused by a virus, named âherpes simplexâ. Fever blisters are contagious and are usually mistaken to be canker sores (which are actually mouth ulcers and occur inside the mouth).
The spinal ganglia or dorsal root ganglia contain the cell bodies of sensory neurons entering the cord at that region. nerve-a group of fibers (axons) outside the CNS. The spinal nerves contain the fibers of the sensory and motor neurons.A nerve does not contain cell bodies.They are located in the ganglion (sensory) or in the gray matter (motor). tract-a group of fibers inside the CNS. The spinal tracts carry information up or down the spinal cord, to or from the brain.he spinal cord is the connection center for the reflexes as well as the afferent (sensory) and efferent (motor) pathways for most of the body below the head and neck. The spinal cord begins at the brainstem and ends at about the second lumbar vertebra.
The anterior nerve roots contain motor fibers, and the posterior nerve roots contain sensory fibers. The spinal nerve roots merge to form spinal nerves (spinal nerves contain both sensory and motor fibers) where they leave the vertebral canal.