anencephaly
Fyler:4332
anencephalia
MP:0000915
anomaly that occurs when the anterior neuropore of the neural tube fails to close, resulting in the congenital partial or complete absence of the cranial vault accompanied by absence of overlying tissues, including the brain and cerebral hemispheres, skull and scalp; in affected organisms, the forebrain remains in contact with the amniotic fluid and subsequently degenerates, including the cerebrum (areas responsible for cognition); any remaining brain tissue, such as the brain stem, is often exposed
MPheno.ontology
MP:0001890
abnormal nervous system development