SECRETION. 335 



excites the abundant secretion of urine in hysterical paroxysms, as well 

 as the perspirations, and, occasionally, diarrhoea, which ensue under the 

 influence of terror, and the tears excited by sorrow or excess of joy. The 

 quality of a secretion may also be affected by mental conditions, as in 

 the cases in which, through grief or passion, the secretion of milk is al- 

 tered, and is sometimes so changed as to produce irritation in the ali- 

 mentary canal of the child, or even death (Carpenter). 



Relations between the Secretions. The secretions of some of 

 the glands seem to bear a certain relation or antagonism to each other, 

 by which an increased activity of one is usually followed by diminished 

 activity of one or more of the others; and a deranged condition of one 

 is apt to entail a disordered state in the others. Such relations appear 

 to exist among the various mucous membranes; and the close relation 

 between the secretion of the kidney and that of the skin is a subject of 

 constant observation. 



The Mammary Glands. 



Structure. The mammary glands are composed of large divisions or 

 lobes, and these are again divisible into lobules, the lobules being com- 



FIG. 228. Dissection of the lower half of the female mamma during the period of lactation. 

 ?s. In the left hand side of the dissected part the glandular lobes are exposed and partially 

 unravelled; and on the right-hand side, the glandular substance has been removed to show the 

 reticular loculi of the connective tissue in which the glandular lobules are placed: 1, upper part of 

 the mamilla or nipple; 2, areola; 3, subcutaneous masses of fat; 4, reticular loculi of the connective 

 tissue which support the glandular substance and contain the fatty masses; 5, one of three lac- 

 tiferous ducts shown passing towards the mamilla where they open; 6. one of the sinus lactei or 

 reservoirs; 7, some of the glandular lobules which have been unravelled; 7', others massed together 

 '(Luschka). 



posed of the convoluted subdivision of the main ducts (alveoli). The 



