Neurotransmitter of ANS

Acetylcholine (Ach)

 It is the main neurotransmitter of parasympathetic system and released from:

1. Nerve endings of pre-ganglionic parasympathetic and sympathetic neurons.

2. Nerve terminals of post-ganglionic parasympathetic neurons.

Noradrenaline (N-Ad):

• It is the main neurotransmitter of the sympathetic system.

• It is released from the post-ganglionic sympathetic nerve terminals.

• Exception: The post-ganglionic nerve terminals to the sweat glands are anatomically sympathetic, but their neurotransmitter is acetylcholine.