Quain's elements of anatomy . illary acquiring processes and becoming united by these withthe connective tissue cells of the pulp. In this manner their blood canflow directly into the interstices of the pulp tissue. The veins, whichform a network of intercommunicating spaces within the pulp, commencein the same manner as the capillaries terminate ; that is to say, thelayer of flattened cells which lines and mainly composes their walls, onbeing traced back, loses its epithelioid character, and the cells, becomingthickened and spindle-shaped and their nuclei prominent, are foundto be separated h
Quain's elements of anatomy . illary acquiring processes and becoming united by these withthe connective tissue cells of the pulp. In this manner their blood canflow directly into the interstices of the pulp tissue. The veins, whichform a network of intercommunicating spaces within the pulp, commencein the same manner as the capillaries terminate ; that is to say, thelayer of flattened cells which lines and mainly composes their walls, onbeing traced back, loses its epithelioid character, and the cells, becomingthickened and spindle-shaped and their nuclei prominent, are foundto be separated here and there from each other, and to be connectedby processes with the cefls of the pulp (fig. 555). The small veins takea different course from the arteries, for they soon pass to the trabeculgeand are conducted upon and within these, freely joining and anasto-mosing ; whereas the arteries appear to have few or no anastomoseswithm the substance of the organ. The small veins within the puljD of the human spleen often exhibit. SUPEAEENAL BODIES. 643 peculiar transverse markings. These are produced by fine elastic fibresof the reticulum above described, which enchcle the vessels. From the description above given, it would appear tliat the blood in passingthi-ough the spleen is brought into immediate relation with the elements of thepulp, and no doubt undergoes important changes in the passage ; in this respectresembling the lymph as it passes thi-ough the lymphatic glands. Two modifica-tions which are probably effected in it may be here pointed out. In the firstplace the lymphoid tissue ensheathing the arteries, together with that composingthe Malpighian corpuscles, would appear, like the same tissue in the lymphaticglands, and other parts, to be the seat of the production of pale blood the cu-cuniference of this tissue, these may pass into the interstices of thepulp, and so into the blood. It is found, in fact, that the blood of the splenicvein is extremely rich i
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