. Anatomy, descriptive and surgical. estion, and variesconsiderably according to the state of nutrition of the body, being large in highly-fed and small in starved animals. In intermittent and other fevers it becomes muchenlarged, weighing occasionally from 18 to 20 pounds. Structure.—The spleen is invested by two coats—an external serous and aninternal fibro-elastic coat. The external or serous coat is derived from the peritoneum; it is thin, smooth,and in the human subject intimately adherent to the fibro-elastic coat. It investsalmost the entire organ, being reflected from it at the hilum o
. Anatomy, descriptive and surgical. estion, and variesconsiderably according to the state of nutrition of the body, being large in highly-fed and small in starved animals. In intermittent and other fevers it becomes muchenlarged, weighing occasionally from 18 to 20 pounds. Structure.—The spleen is invested by two coats—an external serous and aninternal fibro-elastic coat. The external or serous coat is derived from the peritoneum; it is thin, smooth,and in the human subject intimately adherent to the fibro-elastic coat. It investsalmost the entire organ, being reflected from it at the hilum on to the great end ofthe stomach, and at the upper end of the organ on to the Diaphragm. The -fibro-elastic coat forms the framework of the spleen. It invests the exte-rior of the organ, and at the hilum is reflected inward upon the vessels in the formof vao-inse or sheaths. From these sheaths, as well as from the inner surface of thefibro-elastic coat, numerous small fibrous bands, trabeculce (Fig. 598), are given off Fig. Transverse Section of the Spleen, showing the Trabecular Tissue and the Splenic Vein and its Branches in all directions; these, uniting, constitute the areolar framework of the framework of the spleen resembles, therefore, a sponge-like material, consist-ing of a number of small spaces or areolce, formed by the trabecule which aregiven off from the inner surface of the capsule or from the sheaths prolongedinward on the blood-vessels; and in these spaces or areolae is contained the splenicpulp. The proper coat, the sheaths of the vessels, and the trabecule consist of a densemesh of white and yellow elastic fibrous tissues, the latter considerably is owing to the presence of this yellow tissue that the spleen possesses a consider-able amount of elasticity to allow of the very great variations in size that it presentsunder certain circumstances. In some of the Mammalia, in addition to the usualconstituents of this tunic, th
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