section: a self-contained part of a larger composition (written or musical)
writing: the work of a writer; anything expressed in letters of the alphabet (especially when considered from the point of view of style and effect)
myelomeningocele: a congenital defect of the central nervous system in which a sac containing part of the spinal cord and its meninges protrude through a gap in the vertebral column; frequently accompanied by hydrocephalus and mental retardation