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MICTURITION REFLEX

Video done by students of 1st year BHMS KLE Homoeopathic Medical College. (Batch 2020-21) MICTURITION REFLEX Micturition is the process of voiding of urine from urinary bladder , urethra and then it is let out. It is a reflex process called micturition. Micturation reflex is the reflex through which urination occur. When 300 -400 ml of urine is filled in urinary bladder the muscles of urinary bladder stretches and intravesicular pressure increases This causes stimulation of stretch receptors present on wall of urinary bladder. These produces afferent/sensory impulses which are send to the sacral segment of spinal through pelvic nerve fibers. Sacral segment produces efferent/motor impulses which again send to urinary bladder through pelvic nerve fibers This causes contraction of detrusor muscles and relaxation of internal sphincter. The urine flows to urethra When urine enters the urethra there is stimulation of stretch receptors present in wall of urethra It produces afferent/sensory impulses which are sent to the sacral segment through pelvic nerve fibers. The efferent impulses produced in sacral segment inhibit the pudendal nerve This causes the relaxation of external sphincter. Due to this urine is voided out