. Journal of anatomy. snout to vent measurement of the Platypusis 87 cm. and width 18 cm. Ecliidaa {Echidna aculeata). As in the Platypus, three main portions of the spleen may be recognised(fig. 2), viz. body and two processes; but while uniformity is characteristic The Spleen in Monotremes and Marsupials 3 of the spleen of the Plat>^pus, although conforming to the general characterit is rare in the Echidna to rind two spleens alike. (1) Body.—This is better defined than in Platypus and is in relati<jn tothe stomach fundus, being directed towards the aSoj)hagus. It is suspendedin the gr
. Journal of anatomy. snout to vent measurement of the Platypusis 87 cm. and width 18 cm. Ecliidaa {Echidna aculeata). As in the Platypus, three main portions of the spleen may be recognised(fig. 2), viz. body and two processes; but while uniformity is characteristic The Spleen in Monotremes and Marsupials 3 of the spleen of the Plat>^pus, although conforming to the general characterit is rare in the Echidna to rind two spleens alike. (1) Body.—This is better defined than in Platypus and is in relati<jn tothe stomach fundus, being directed towards the aSoj)hagus. It is suspendedin the great omentum, the width of which, even in a male adult, only ecjuals1 cm.; and so at this early stage we obtain the definition of a gastro-splenicomentum. Its length varies from 3 to 5 cm. and the width -5 to 1 cm. (2) The right ventral process is the longer of the two and is also sus-pended in the great omentum (lesser sac), the width of which at its anterior CBSOPHAdUS PYLORUS \^ 1 OUOD£NUM \ \ j RT ANT : PROC ~.. acsofMAaus l7 distal colon \ V% MesocoLONFig. 2.—The peritoneal relations of tlie spleen in Echidna. extremity is 7 cm.; so that it is more mobile than the body. Its averagelength is 5 to 7 cm. and width 5 to 15 cm. (3) Left dorsal process.—This is shorter than the anterior, and twoportions may be recognised, viz. a stem terminating in a pear-shaped body,which may be smooth or (especially in smaller specimens) corrugated. Thestem rarely runs directly into this portion. Usually there is narrowing atthe point of attachment, and the connection between the two may be merelya slender fibrous thread. The stem varies from 1-5 to 3 cm. in length andaverage width -5 cm., while the body varies from 2 to 35 cm. in length andcircumference may reach 5 to 6 cm. This process, as in Platypus, lies outsidethe lesser sac in relation to the lieno-mesocolic fold, extending caudallytowards the pelvis on the left of the distal colon. In one specimen out ofa large number examined, I
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectanatomy, bookyear1867
