legal blindness - vision that is 20/200 or worse in both eyes (20/200 vision is the ability to see at 20 feet what a normal eye can see at 200 feet) blindness, cecity, sightlessness - the state of being blind or lacking sight.
In this review, we outlined those postural reflexes related to pathways and structures involving the cervical spine, the eyes, and the inner ear. How these structures and pathways obtain somatosensory input, interact with each other, and modulate postural changes and corrections has been described here.
5. The effector, muscle fibers or glands, responds to the efferent impulses by contracting or secreting a product, respectively. Figure 1. Simple reflex arc. Components of all human reflex arcs: receptor, sensory neuron, integration center (one or more synapses in CNS), motor neuron, and effector.owever, most reflexes are more complex and polysynaptic, involving the participation of one or more association neurons in the reflex arc pathway. A three-neuron reflex arc (flexor reflex) is diagrammed in Figure 2b.