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.
Definition. noun, plural: afferent nerves. The type of nerve that carries sensory nerve impulses from the periphery towards the central nervous system. Supplement. The peripheral nervous system of vertebrates has two main types of nerves.These are the efferent nerves and the afferent nerves.oun, plural: afferent nerves. The type of nerve that carries sensory nerve impulses from the periphery towards the central nervous system. Supplement. The peripheral nervous system of vertebrates has two main types of nerves.