Final answer:
Myelomeningocele is the most severe form of spina bifida, involving the protrusion of the meninges and spinal nerves through the spinal column with severe neurological symptoms.
Step-by-step explanation:
Myelomeningocele is a type of spina bifida in which a baby is born with a gap in the bones of the spine. It is the most severe form of spina bifida and involves the protrusion of the meninges and spinal nerves through the spinal column, resulting in severe neurological symptoms. Surgery to close the gap or remove the cyst is often necessary to control or limit further damage or infection. Complications may present later in life, but overall life expectancy is not reduced.