Nerve supply to musculature of urinary bladder is -
Ans. is 'c' i.e., Both o Parasympathetic supply is motor to detrusor muscle and inhibitory to sphinchter vesicae. Sympathetic supply is motor to sphincter vesicae and inhibitory to detrusor muscle.Nerve supply of bladdero Bladder is supplied by both sympathetic and parasympathetic fibers.Parasympathetic : Preganglionic fibers arise from S2 to S4 cord segments, pass via pelvic splanchnic nerves. After relay in ganglion cells in pelv ic plexus (inferior hypogastric plexus) and in bladder w all, postganglionic fibers supply detrusor muscle. Contraction of detrusor muscle is mediated by cholinergic muscarinic receptors (Mj).Preganglionic parasympathetic neurons at S2. S3, and S4 cord segments innervating bladder form sacral micturition center.Sympathetic : Preganglionoic fibers arise from lateral horn cells of T11-L2 cord segments and pass via lower lumbar splanchnic nerves, superior hypogastric plexus (presacral nerve of Latarjet) to reach inferior hypogastric (pelvic) plexus. After relay in pelvic ganglia, postganglionic sympathetic fibers (i) stimulate sphincter vesicae (internal urethral sphincter) via a1 adrenoceptors and (ii) cause relaxation of detrusor muscle via b2 adrenoceptors. It can also inhibit presynaptically the parasympathetic ganglia via a2. adrenoceptors1. Visceral afferents : (1) pain fibers from bladder pass through both parasympathetic and sympathetic pathway and enter T11-L2 and S2-S4 cord segments, hence referred pain is felt in lower part of anterior abdominal wail (hypogastrium), upper part of front of thigh, scrotum or labium majus, penis or clitoris, and perineum. Centrally, spinothalmic pathway conducts pain impulses from bladder.2. Stretch afferents : arising from stretch receptors in the bladder wall pass via pelvic splanchnic nerves, enter S2, S3 and S4 cord segments and establish reflex connections with sacral micturition center, which innervates detrusor.So afferent and efferent limb of this micturition reflex is formed by pelvic splanchnic nerves.Sacral mictmition center and the micturition reflex are controlled by facilitatory and inhibitory centers located in pons and paracentral lobule of frontal lobe of cerebum.
Symphathetic
Parasympathetic
Both
None
KUB & Adrenal Gland