Human anatomy, including structure and development and practical considerations . bularcharacter of the young liver is soon lost and replaced by the reticular arrangementproduced in consequence of the growing together and union of the terminal di\is-ions of the gland. Coincidently with the formation of the net-work of glandular tissue by thejunction of the cylinders of hepatic cells, the meshes of the reticulum become occu-pied by blood-vessels derived from vitelline veins. These are now represented atthe hepatic anlage by venous stumps from which numerous afferent branches {vencehepaticce adv
Human anatomy, including structure and development and practical considerations . bularcharacter of the young liver is soon lost and replaced by the reticular arrangementproduced in consequence of the growing together and union of the terminal di\is-ions of the gland. Coincidently with the formation of the net-work of glandular tissue by thejunction of the cylinders of hepatic cells, the meshes of the reticulum become occu-pied by blood-vessels derived from vitelline veins. These are now represented atthe hepatic anlage by venous stumps from which numerous afferent branches {vencehepaticce advehentes) penetrate the liver-mass to become the portal system. Thedivision, subdivision, and union of these blood-vessels keep jiace with the increasingcomplexity of the net-work of hepatic cords, the intergrowth of these constituentseventually leading to the intimate relations between the hepatic secreting tissue andthe intralobular capillaries seen in the fully developed organ. The cell-trabccuL-ecomposing the primary hepatic net-work are partly solid and partly hollow ; the. Till-: APPARATUS. 1725 latter, with a portion of those without a hiinen, arc coiivertctl into the system ofbile-canals, while the reniainin_y eylinders ^ive otT additional sprouts \vhich reducethe intervening^ meshes and increase the solidity of the orj^an. The solid cylindersof secreting tissue at first contain no bile-capillaries. The latter are hollowed outbetween two adjacent cells as extensions of the meanwhile differentiating biliaryducts. Differentiation of the developing liver into lobules does not occur until thebeginning of the fourth foetal month, by which time the larger blood-vessels andbile-ducts become surrounded by condensations of the mesoderm which form thecapsule of Glisson. The details of the formation of the hepatic blooti-vessels are considered in con-nection with the dexelopmeiit of the veins (page 928). It may be here men-tioned, however, that the primary circulation of t
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