One of the first things that most designers forget about CSS descendant selectors is that they are flexible. When CSS defines a descendant, it doesn't care whether the tag in question is the direct child, the grandchild, or some great-great-great-descendant of the initial element.
From the retina, visual information passes onto the bipolar cells and then to the optic nerve's ganglion cells. The optic nerve, which begins at the retina, is the sole visual pathway to the brain. Light information is conveyed as an electrical action potential through the neurons.
The central nervous system relies on pathways and higher order functions to transfer information to various parts of the brain, giving the body sensory and motor ability. There is a constant interaction going on between the brain, spinal cord, and the peripheral nervous system (PNS).Pathways are either ascending (sensory) or descending (motor) and contain tracts and nuclei, where signals from one neuron to another creates a synapse.hey are in the skin, joints, muscles and viscera (Noback 155). Sensory systems transmit information regarding intensity. Receptors of pain are called nociceptors. Each of the pathways involve a chain of neurons named accordingly, a first order neuron is a neuron that delivers directly to the CNS or its cell body.