Textbook of normal histology: including an account of the development of the tissues and of the organs . yare well seen in the pancreas of manand most mammals. The blood-vessels of the pan-creas are distributed very similarlyto those of the salivary glands. The larger arterial branches runwithin the interlobular connective tissue, sending off vessels whichpass between the lobules and supply the glandular parenchyma withtwigs. These latter enter the lobules and form net-works which en-close the individual acini within the capillary reticulum. The capil-laries lie beneath the basement-membrane i
Textbook of normal histology: including an account of the development of the tissues and of the organs . yare well seen in the pancreas of manand most mammals. The blood-vessels of the pan-creas are distributed very similarlyto those of the salivary glands. The larger arterial branches runwithin the interlobular connective tissue, sending off vessels whichpass between the lobules and supply the glandular parenchyma withtwigs. These latter enter the lobules and form net-works which en-close the individual acini within the capillary reticulum. The capil-laries lie beneath the basement-membrane in close relation with theglandular epithelium. The veins accompany the arterial trunks withinthe connective tissue. The lymphatic vessels also accompany the arteries, lying be-tween the lobules and receiving as tributaries the lymph-radiclesoriginating within the lobule between the acini. The larger nerve-trunks are confined to the connective tissue between the divisionsof the gland, in which situation many accompanying microscopicganglia also are found. The ultimate termination of the nerve-fibres,. Section of human pancreas, exhibiting oneof the areas (a) of immature gland-cells; i,the usual acini THE DIGESTIVE TRACT. I87 as in the case of the salivary glands, is still undetermined ; thefibrillar are traceable to the basement-membrane of the acini, buttheir further accurate disposition remains undecided. The development of the digestive tract and its appendages in-volves all three blastodermic layers, the mesoderm and the ento-derm, however, being the ones participating to the greatest epithelium of the mucous membrane, together with that of theglandular structures connected therewith, is the direct derivative ofthe entoderm, with the exception of that lining the oral cavity ante-rior to the fauces and the salivary and oral glands, the epithelium ofwhich parts originates from the ectodermic invagination. For a shortdistance within the anus, likewise, the ectoderm c
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Keywords: ., bookauthorpiersolgeorgeageorgea, bookcentury1800, bookdecade1890
