. "'i '*â . >'i; '; i -^ .,. â¢â â :- â .'.--:r-,. â â .â¢â ; " -%.v ' â .â 'â â :â :â¢..â¢: : ;= -â ^^'â .â 'â ^-j Fig. 135. Section of the immature mammary gland. Fig. 136. Section of mammary gland in functional activity. The intermediate stage occurs in certain sexually mature whales in which the mammary glands are not functionally enlarged. It has been seen that during lactation the lobules become greatly swollen and compress the intervening connective tissue into the smallest possible space. In the intermediate stage the lobules appear either to have started swelling in pr
. "'i '*â . >'i; '; i -^ .,. â¢â â :- â .'.--:r-,. â â .â¢â ; " -%.v ' â .â 'â â :â :â¢..â¢: : ;= -â ^^'â .â 'â ^-j Fig. 135. Section of the immature mammary gland. Fig. 136. Section of mammary gland in functional activity. The intermediate stage occurs in certain sexually mature whales in which the mammary glands are not functionally enlarged. It has been seen that during lactation the lobules become greatly swollen and compress the intervening connective tissue into the smallest possible space. In the intermediate stage the lobules appear either to have started swelling in preparation for lactation, or, more often, are in the process of contracting after the end of lactation. This, condition is never found in pregnant whales except at the very end of gestation, but it is curious that it occurs more often in "resting" whales than the normal resting condition which is almost always present in pregnant whales. The lobules are still large (Fig. 137), and, though noticeably smaller than in lactating whales, they are considerably better developed than in the resting stage. The connective tissue space is still restricted, but the alveoli are shrivelled and smaller than in the lactating gland, their outline is less easily traced, and their lumen, at least in haematoxylin-eosin preparations, is not easy to distinguish. Droplets are practically absent from the alveoli, though one or two may sometimes be visible 19-2
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectocean, booksubjectsci
