A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . nd when unilateral they are oftener found on the *The weight of opinion is in favor of the sudoriparous ratherthan the sebaceoua glanus, as the source from -which the mammarygland is evolved. See the section on Development, above. left side than on the right side, and above the levelof the umbilicus than below it. The ordinary siteis somewhat below and internal to the normal glands,in which position three-fourths of all the cases are soplaced. The next most prevale
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . nd when unilateral they are oftener found on the *The weight of opinion is in favor of the sudoriparous ratherthan the sebaceoua glanus, as the source from -which the mammarygland is evolved. See the section on Development, above. left side than on the right side, and above the levelof the umbilicus than below it. The ordinary siteis somewhat below and internal to the normal glands,in which position three-fourths of all the cases are soplaced. The next most prevalent position is above thenatural ones and toward the axilla. When below thenormal breasts they are apt to be more fully developedand provided with better formed nipples. Leichten-sterns table of 105 cases shows the relative positionof accessory breasts to be, the anterior side of thethorax ninety-six cases, and axilla live cases (fourcases were wandering). It is probable that many ofthe axillary accessory mammas are prolongations orsequestrations from the normal breast, and may bemistaken for lymph nodes, sebaceous cysts, and. Fig. 1108.—Supernumerary Nipples and Small MammaryGlands in the Axillse. (McGilUcuddy, Medical Record, October 10,1891.) fatty tumors. Occasionally they are met with invarious localities outside of the milk line, as theaxilla, the anterior mid-line, abdomen, back, on theshoulder, hip, thigh, labium, the lip, and the ear; andin a few instances they have been noted occupyingthe inner waU of dermoid cysts of the ovary. Leich-tenstern and Bruce in a collection of 166 cases ofmultimammce found only four ( per cent.)aberrantly disposed. When occupying sucn aberrantsites they are designated mammce erraticae, andare supposed to be caused by a reversion to an ances-tral type much more remote than the other moreusual forms. In polymastia the normal pectoralbreasts are always naturally situated and welldeveloped. The number of accessory breasts may vary fromone
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