Human anatomy, including structure and development and practical considerations . iform, since, as has been shown by Opie, whileabout equally numerous in the head and adjacent part of the body of the organ, theymay be almost double in number towards the tail. The cells composing these masses,although developed from the same tissue which gives rise to the usual glandularelements of the pancreas, differ from the latter in being smaller, polygonal ratherthan pyramidal in form, less granular, and undifferentiated into the characteristiczones usually seen in the pancreatic cells. They are arranged
Human anatomy, including structure and development and practical considerations . iform, since, as has been shown by Opie, whileabout equally numerous in the head and adjacent part of the body of the organ, theymay be almost double in number towards the tail. The cells composing these masses,although developed from the same tissue which gives rise to the usual glandularelements of the pancreas, differ from the latter in being smaller, polygonal ratherthan pyramidal in form, less granular, and undifferentiated into the characteristiczones usually seen in the pancreatic cells. They are arranged as a net-work con-sisting of solid cords or trabeculae, the meshes of which are occupied by blood-capillaries of large size ; the whole recalling the arrangement of hepatic tissue. Noextension of the system of excretory tubes has been demonstrated within thesecell-islands, secretion-capillaries being therefore wanting. The significance of theislands of Langerhans has long been a subject of dispute, but in view of their isola- ^ Johns Hopkins Hospital Bulletin, September, Section of pancreas, showing interlobular connective tissue with vesselsand duct surrounded by tubular alveoli. X 200. 1736 HTMAX AXATOMV Connective-tissue envelofje tion from the surrounding glandular tissue and their close relation with the blood-vessels, the opinion is held by many that they jjroduce some suljstance which passesdirectly into the blood and may be regarded, at least provisionally, as concerned in internal secretion. The Pancreatic Ducts.—The gland is surrounded by a fibrous sheath whichsends in many processes dividing it into small lobules. The chief excretory canal inthe adult is the duel of Wirsiin^ (ductus pancrcaticus), which, beginning near the endof the tail, runs througli the middle of the pancreas towards the riglit, and bendsdownward as it passes through the head. Branches sprout from the main ductat right angles, which receive bunches of smaller ramifications. The diameter o
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
