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 neurons (also known as sensory neurons or afferent nerve fibers) are pathways that carry sensory information from the body to the central nervous system (the brain and spinal cord).fferent neurons (also known as sensory neurons or afferent nerve fibers) are pathways that carry sensory information from the body to the central nervous system (the brain and spinal cord).