. Animal and vegetable physiology, considered with reference to natural theology, by Peter Mark Roget ... Biology; Physiology; Plant physiology; Natural theology. 182 THE VITAL FUNCTIONS. ! a simple sac, composed of several membranes, enclosing thin layers of muscular fibres, abun- dantly supplied with blood-vessels and with nerves, and occasionally containing structures which appear to be glandular. The human sto- mach, which is delineated in Fig. 301, exhibits. one of the simplest forms of this organ; c being the cardiac portion, or part where the oesophagus opens into it; and p the pyloric
. Animal and vegetable physiology, considered with reference to natural theology, by Peter Mark Roget ... Biology; Physiology; Plant physiology; Natural theology. 182 THE VITAL FUNCTIONS. ! a simple sac, composed of several membranes, enclosing thin layers of muscular fibres, abun- dantly supplied with blood-vessels and with nerves, and occasionally containing structures which appear to be glandular. The human sto- mach, which is delineated in Fig. 301, exhibits. one of the simplest forms of this organ; c being the cardiac portion, or part where the oesophagus opens into it; and p the pyloric portion, or that which is near its termination in the intestine. At the pylorus itself, the diameter of the pas- sage is much constricted, by a fold of the inner membrane, which is surrounded by a circular band of muscular fibres, performing the office of a sphincter, and completely closing the lower orifice of the stomach, during the digestion of its contents. The principal agent in digestion, as far as the ordinary chemical means are concerned in that operation, is a fluid secreted by the coats of the i. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Roget, Peter Mark, 1779-1869. London : W. Pickering
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