During the period of lactation the milk glands in the breast secrete milk continuously. The fluid fills the network of tiny tubes which converge near the nipple and empty into fifteen to twenty small temporary reservoirs called milk sacs, which are about the size of beans. The milk sacs are under the dark area (areola) which surrounds the nipple, with which they are connected by milk ducts. Not all of the milk sacs are just beneath the skin; therefore, complete emptying of the breast requires gentle pressure on the tissue underlying the entire areola. In
Manual expression of milk by the nurse (A) and by the mother (B). nursing, the infant draws the nipple well into his mouth so that his lips compress the entire area behind which the milk sacs lie. There are many conditions which permanently or temporarily prevent a mother from nursing her infant, but most of
DAVIES V. XXI. A SIMPLE TECHNIC FOR THE MANUAL EXPRESSION OF MOTHERS' MILK. Am J Dis Child. 1945;70(3):148–149. doi:https://doi.org/10.1001/archpedi.1945.02020210015003
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