<prompt> Deglutitive inhibition:Wave of inhibition preceding esophageal peristalsisInhibition of deglutinationDoes not involves a higher centerCan be voluntary  <response>: Ans. A. Wave of inhibition preceding esophageal peristalsisOption a is correct and b is incorrect because degultitive inhibition is an inhibitory wave induced by swallowing and then a contractile wave appears. A wave of inhibition precedes a swallow- induced peristaltic contraction in the esophageal smooth muscle.Option c is incorrect because the brain stem controls the inhibition of the esophageal skeletal muscle, the smooth muscles have an intrinsic peripheral control mechanism.Option d is incorrect because local gradients of inhibitory and excitatory myenteric nerves determines the latency between swallow and contractions.Deglutition reflex:AfferentCenterNucleiEfferent5th, 9th and 10th CN receptor mainly in tonsillar pillars epithelium, etc.NTS, NA-Degulitation center areas in medulla and lower ponsinhibit Respiratory center in medulla5th, 7th, 9th, 10, 12th CN, few superficial cervical nerves pharyngeal and tongue muscles, etc.Mastigation reflex:AfferentCenternucleiEfferentVia 5th and 9th C.N. Bolus of food in mouthIn brainstem connection with reticular areas in brainstem taste centers, hypothalmus, amygadala and cerebral cortex near sensory area for taste and smellVia 5th CN muscles of masticationReflex inhibition of the muscles 