A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  

nerve(s) — cells in the human body that are the building blocks of the nervous system (the system that records and transmits information chemically and electrically within a person). Nerve cells, or neurons, are made up of a nerve cell body and various extensions from the cell body that receive and transmit impulses from and to other nerves and muscles. Nerve tissue in the breast makes breasts sensitive to touch, allowing the baby's sucking to stimulate the let-down or milk-ejection reflex and milk production.

nipple — the protruding part of the breast that extends and becomes firmer upon stimulation. In breastfeeding, milk travels from the milk sinuses through the nipple to the baby.

nipple shield — an artificial latex or silicone nipple used over the mother's nipple during nursing.

nurse-midwife — A nurse who has undergone special training and has received certification on birthing (labor and delivery). Nurse-midwifes can perform most of the same tasks as physicians and have emergency physician backup when they deliver a baby.