Textbook of normal histology: including an account of the development of the tissues and of the organs . retarded current within thesplenic pulp is favorable to the removal anddestruction of the worn-out red cells and tothe acquisition of additional leucocytes.Within the pulp, while passing from thearteries to the veins, the blood is probablynot confined to channels provided with defi-nite walls, but comes into direct relationwith the lymphoid tissue. The lymphatics of the spleen are limitedto the connective-tissue framework of theorgan, in which they form a superficialplexus in the deeper lay
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Textbook of normal histology: including an account of the development of the tissues and of the organs . retarded current within thesplenic pulp is favorable to the removal anddestruction of the worn-out red cells and tothe acquisition of additional leucocytes.Within the pulp, while passing from thearteries to the veins, the blood is probablynot confined to channels provided with defi-nite walls, but comes into direct relationwith the lymphoid tissue. The lymphatics of the spleen are limitedto the connective-tissue framework of theorgan, in which they form a superficialplexus in the deeper layers of the capsule, and a deeper plexus within the trabecular.The lymphatic clefts within the adventitiaof the arteries communicate with the deeperlymphatics of the trabeculae ; regarding thedefinite relations of the deeper lymphaticsour knowledge is incomplete. The nerves of the spleen are composedmostly of non-medullated fibres, althougha few of the medullated variety are present;they are distributed to the walls of the blood-vessels ; also ganglion-cells have been ob-served along the nerve-trunks.. Diagram of the relations ofsplenic vessels to the tissue of thepulp: a, v, small arterial andvenous branches of splenic vesselswithin trabecula {t, t) ; one twigof artery is diverted and becomesensheathed by tissue of the Mal-pighian corpuscle, M; the remain-ing part of the artery follows thetrabecula and passes directly intothe spaces of the pulp—in eithercase the arterial branches termi-nate in the spaces (/, /) withinthe pulp surrounded by the lym-phoid tissue (/, /) ; the venousradicles take up the blood andcarry it from the spaces of thepulp into the larger venoustrunks. THE THYMUS BODY. The thymus body is included among the lymphatic tissues on ac-count of the histological characteristics of the fully-developed organ ;in its early stages, however, the bulk of the organ is epithelial innature, being derived from the endodermic cells and closely resem-bling many glands in its