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 arc for micturition invovles the sensory input (the afferent neruon) to the spinal cord consisting of the stretch receptors located on the urinary bladder and the effer â¦ ent neurons consisting of the parasympathetic (usually pelvic splanchincs). The pelvic splanchnic cause the detrusor muscle to contract. The reflex arc also contains an efferent somatic (pudendal nerve) output to the external sphincter which relaxes the external sphinctor and causes the urine to flow through the urethra.