Neuro transmitters of Autonomic Nervous System
Acetyl choline (Ach)
This is the neuro transmitter produced by preganglionic fibers of both sympathetic & parasympathetic systems. Post ganglionic fiber of parasympathetic system produce Ach at their neuro effector site in visceral organ
Adrenaline/Nor-adrenaline
- Post ganglionic fibers of sympathetic system produce noradrenaline or adrenaline at their neuro effector site on the effector organs.
- Exception–
- Isolated preparation of sympathetic neuro effector junctions of cat’s sweat gland secrete Ach.
- HYPOGASTRIC sympathetic supply to the uterus of bitch receives Ach as post ganglionic sympathetic neuro transmitter.
- Stellate ganglionic sympathetic fibers at their post ganglionic end secretes Ach in corony supply of cat and dog.
- Other-
- Sympathetic vasodilators secreting Ach is seen in the buccofacial region of dog, hind limb muscles of cat, coronary arteries of dog and cat, and penis in dog.