Veterinary Neuropharmacology

SELECTED EFFECTS ON DIFFERENT ORGANS

Structure	Sympathetic Activation	Parasympathetic Activation
Iris (Radial Muscle) (Sphincter Muscle)	Pupil dilated ---	--- Pupils constricted
Glands Lacrimal Salivary secretion Sweat	--- Increased lacrimation  Scanty viscous  and thick secretion  in the palms	Increased secretion Increased lacrimation Generalized secretion - copious watery secretion
Heart Rate Force (Ventricles)	Increased Increased	Decreased Decreased
Blood Vessels	Constiction (generally) Dilation (large blood vessels)	Slight effect; Dilation in some
Bronchi Intestine	Dilated Tone & motility decreased	Constricted Tone & motility increased
Adrenal Medulla	Secretion of epinephrine and norepinephrine	---
Sex Organs	Vasoconstriction, Contraction of vas deferens, Seminal vesicle and Prostatic musculature (ejaculation)	Vasodilatation & erection