A treatise on special and general anatomy: in two volumes (Volume 2).

  • Horner, William E. (William Edmonds), 1793-1853.
Date:
1826
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on special and general anatomy: in two volumes (Volume 2). Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    must be separately injected through its papillary conduit. This rule is not however of universal application, as in some experiments performed by the elder Meckel upon women ad- vanced in pregnancy and during lactation, he succeeded in forcing mercury through one sinus, by its ramifications, into those of another; this route was supposed to have been through the finest extremities of the duels. The whole gland itself may, however, from the infrequency of this circum- stance, and from the difficulties and partial condition of these anastomoses, rather be considered as a congeries of smaller glands, kept distinct by the interposition of cellular substance between their lobes ; but joined, in one respect, by having the terminations of their excretory tubes collected into one bunch in the nipple. This latter circumstance seems to be only a provision for the more convenient suck- ling of the infant. The excretory ducts are no where furnished with valves, which accounts for the facility with which they may be in- jected backwards from the nipple. An opinion was enter- tained by Haller, and by other anatomists after him, that some of these ducts originated in the surrounding cellular substance, but this has been refuted by the researches of Cu- boli. Some anatomists have thought that there is a direct communication between the ends of the lactiferous tubes and the arteries, veins, and lymphatics. Mascagni, after a very successful injection of the gland, whereby its vesicles were filled with quicksilver, not meeting with such an occurrence, was induced to think that when the communication did hap- pen, it was produced by rupture. The Areola, Is a rose-coloured circle in virgins which surrounds the base of the papilla or nipple. \\\ women who have borne children, or in those whose age is advanced, it becomes of a dark brown. The skin of the areola is extremely delicate,