Definition: The term anencephaly is a term used in medicine to describe a condition where there's no brain stem or spinal cord to support the developing baby, leading to problems like poor vision, coordination, and speech development. Definition: Anencephaly occurs when the brainstem and spinal cord are not fully formed in the first six months of pregnancy. This can be caused by an abnormal development during pregnancy, usually due to placental abnormalities or a condition called microcephaly (low birth weight). The resulting deformities include features like spina bifida, a misshapen spinal column, and cerebral palsy. For more information on this condition, please consult with a healthcare provider.