Human physiology . com-pletely, and separating them sharply from the alveolar (1879) pointed out a reticulum enclosing the islets, asdid also Opie and Pugnat. On the other hand, Gibbes, Diamare,and Hansemann denied these observations. To solve the problemMarshall Flint (1903) employed tryptic digestion, which sparesthis capsule ; and decided that it existed. Laguesse also admitted it, but stated that the capsule(menibrana propria) does not completely surround the islets, whichcontract relations with the excretory system at the points atwhich they are not invested. Golgis method d
Human physiology . com-pletely, and separating them sharply from the alveolar (1879) pointed out a reticulum enclosing the islets, asdid also Opie and Pugnat. On the other hand, Gibbes, Diamare,and Hansemann denied these observations. To solve the problemMarshall Flint (1903) employed tryptic digestion, which sparesthis capsule ; and decided that it existed. Laguesse also admitted it, but stated that the capsule(menibrana propria) does not completely surround the islets, whichcontract relations with the excretory system at the points atwhich they are not invested. Golgis method demonstrates the origin of the excretory G 3 88 PHYSIOLOGY CHAP. ductulcs within the pancreatic alveoli: like the, salivary glands,they stain a uniform black. As shown iu Fig. 28, the excretoryduct sends lobular branches to these ductules between the cells,and also to the interior of each cell. The blood-vessels penetrate into tbe gland along with thepancreatic duct, ramify in the lobes, and form a capillary network. •• FIG. 28.—Section of two fragments of human pancreas. Silver eliminate method. (E. Miiller.)A, longitudinal section of excretory duct, lined with columnar epithelium ; m, , giving off small diverticula between and into the alveolar cells. B, .shows com-mencement of ductules in alveolar cells (higher magnification). round the lobules and the alveoli with highly uneven meshes,some being so wide that many parts of the alveoli are scantily irrigated with blood. The pancreas contains nerve fibres, both medullated andnon-medullated, which unite with the sympathetic ganglia andthe isolated ganglion cells. On staining with Golgis methodthe fine nerve-fibrils can be followed into the alveoli. In some ii EXTERNAL DIGESTIVE SECRETIONS 89 , cat, numerous corpuscles of Pacini are seen in thepancreas. VII. The pancreatic, like the salivary, secretion is under thecontrol of the nervous system, for it begins a few minutes afterthe food has e
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