Flashcards in Ch.59 Ex:2 Deck (22):
The cephalic neural plate develops the ____, and the caudal end forms the ____ cord.
The forebrain will continue to develop into the ____, the midbrain will become the ____, and the hindbrain will form the ____.
think pms (P.M.R)
Failure of closure of the neural tube at the cranial end is called?
Sonographic features of Anencephaly include:
Abscence of the brain and cranial vault
Rudimentary brain tissue (cerebrovasculosa)
"Froglike"appearance-bulging fetal orbits
Presence of brain tissue w/o thepresence of calvarium
Disorganization of brain tissue
Prominent sulcal markings
A neural tube defect in which the meninges alone or the meninges and the brain herniate through a defect in the calvarium is called?
The term used to describe herniation of the meninges and brain through the defect is called?
(think en-separated,they go together)
Cranial ____ describes the herniation of only meninges.
Fetuses with myelomeningoceles often present with the cranial defects associated with the ____ malformation, which is identified in 90% of patients.
Arnold-Chiari (Type II)
Spina Bifida Features
V or U configuration splaying of the post ossification centers
Protusion of a saclike structure (anechoic or echogenice)
Cleft in the Skin
Posterior fossa cyst
Enlarged Cisterna Magna
Splaying of the cerebellar hemispheres (agensis of cerebeller vermis)
____ holoprosencephaly is characterized by amonoventricle;brain tissue that is small and may have a cup,ball, or pancake configuration;fusion of the thalamus;and absence of the interhemispheric fissure,cavum septi pellucidi,corpus callosum,optic tracts, and olfactory bulbs.
____ holoprosencephaly presents with a single ventricular cavity with partial formation of the occipital horns,partial or complete fusion of the thalamus,a rudimentary flex and interhemispheric fissure, and absent corpus callosum,cavium septi pellucidi, and olfactory bulbs.
Almost a complete division of the ventricles is seen with a corpus callosum that may be normal,hypoplastic,or absent,although the caveum septi pellucidi will still be absent in ____ holoprosencephaly.
A fibrous tract that connects the cerebral hemispheres and aids in learning and memory is the ____ ____.
____ ____ results from obstruction,atresia, or stenosis of the aqueduct of sylvius,causing ventriculomegaly.
Porencephaly or ____ cysts are cysts filled with cerebrospinal fluid.
A rare disorder characterized by clefts in the cerebral cortex is called?
Enlargement of the ventricles occurs with ____of cerebrospinal fluid flow.
Fetal ventriculomegaly typically progresses from the ____ horns into the temporal and then to the ____ ventricular horns.
A ventricle is considered dilated when its diameter exceeds ____ mm.