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.
1 The 1Â° afferent is a pseudounipolar neuron that has its cell body located in a peripheral (spinal or cranial) ganglion. 2  It has a peripheral axon that forms or innervates somatosensory receptors and a central process that synapses with 2Â° afferent neuron(s) in a spinal cord or brain stem nucleus.