VPB 121: Veterinary Physiology - II (2+1)

Neuro transmitter of Autonomic Nervous System

NEURO TRANSMITTER OF ANS

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.