A cataract is a clouding of the lens in the eye that affects vision. Most cataracts are related to aging. Cataracts are very common in older people. By age 80, more than half of all Americans either have a cataract or have had cataract surgery.
Acetylcholine. Acetylcholine (ACh) is the transmitter released by the preganglionic nerve terminals of both the sympathetic and the parasympathetic divisions (Fig 6.2). The synapse at those sites utilizes a nicotinic receptor similar in structure to the receptor at the neuromuscular junction.
Acetylcholine (ACh) and norepinephrine (NE) are the two major neurotransmitters of the ANS ACh is released by all preganglionic axons and all parasympathetic postganglionic axons Cholinergic fibers â ACh-releasing fibers.