Bleeding or spotting later in pregnancy may be a sign of a serious problem, like: 1  Preterm labor. This is labor that happens too early, before 37 weeks of pregnancy. 2  Placenta previa. This is when the placenta lies very low in the uterus and covers all or part of the cervix. 3  Placental abruption.
Afferent definition, bringing to or leading toward an organ or part, as a nerve or arteriole (opposed to efferent). See more.
afferent nerve. any nerve that transmits impulses from the periphery toward the central nervous system. See also neuron, afferent nerve fibers (below). afferent nerve fibers. nerve fibers in the peripheral nervous system carrying information to the brain and spinal cord.arrying inward to a central organ or section, as nerves that conduct impulses from the periphery of the body to the brain or spinal cord. n. An afferent organ or body part, such as a blood vessel.