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.
Reflex Arcs â¢In a knee-jerk reflex arc thesensory neuron directlyconnects to the motor neuronin the spinal cord. This iscalled a simple reflex arc. â¢ Follow the sensory neuronfrom the spindle (receptor) towhere it connects with the motorneuron in the spinal cord.Nerve cells (neurons)carry the message fromthe stimulated receptorsto the correct effectors.â¢ A sensory neuron carriesthe message from the receptorto the central nervous system (the spinal cord and brain). â¢ A motor neuron carries themessage from the centralnervous system to the effector.â¢ This is a reflex arc.