Physiology : a manual for students and practitioners . action of the pillarsof the fauces and the constrictors of the pharynx toward theoesophageal opening. The pharyngeal vault is guarded from in-vasion by solid or liquid food by the valve-action of the soft palate,while the opening of the glottis is protected by the simulta-neous intrinsic muscular closure of the rima glottidis and by thevalve-like cover of the epiglottis. When the muscles of the faucesand tongue push on the food-mass, they also draw up the larynxand dilate the oesophageal opening. 3d. The oesophagus grasps thefood, and a pe
Physiology : a manual for students and practitioners . action of the pillarsof the fauces and the constrictors of the pharynx toward theoesophageal opening. The pharyngeal vault is guarded from in-vasion by solid or liquid food by the valve-action of the soft palate,while the opening of the glottis is protected by the simulta-neous intrinsic muscular closure of the rima glottidis and by thevalve-like cover of the epiglottis. When the muscles of the faucesand tongue push on the food-mass, they also draw up the larynxand dilate the oesophageal opening. 3d. The oesophagus grasps thefood, and a peristaltic wave-series carries it rapidly on to the cardiacopening of the stomach. The beginning (1st) of the act of swallow-ing is voluntary, the remainder reflex, and is governed by centres inthe medulla oblongata acting through the cranial nerves which sup-ply the parts. The trigeminus, glosso-pharyngeus, and vagus bytheir sensory and motor functions act both in the capacity of affer-ent and efferent communication with the medullary centre. Fig. Free Surface of the Gastric Mucous Membrane, viewed from above, from pigs stomach,cardiac portion, moderately magnified. Describe the structure and function of the stomach. The stomach (Fig. 6) is an organ which resembles in structure DIGESTION. 47 the rest of the intestinal tract; it is liollow, having a peritoneal cov-ering antl a mucous membrane lining, with a muscular layer is in this mucous membrane that tlie special function of the stom-ach lies, for here are found glands which secrete the gastric active peristaltic motion churns the food about after deglutition,and exposes it thoroughly to the action of the digestive agents. Thefunction of the stomach is the digestion of proteids. Describe the glands of the stomach. If one looks closely at the mucous surface of the stomach, itis seen to present a sort of reticulated (Fig. 7) appearance,meshes being larger at the pyloric than at the cardiac end ofstomach
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysiology, bookyear1
