Flashcards in Development of the Nervous System Deck (19):
What cell layer does the nervous system develop from?
What is the cell layer origin of the notochord?
Cerebral cortex, basal ganglia, amygdala, hippocampus
Thalamus and hypothalamus
Pons and cerebellum
What does the mantle zone eventually form?
What does the marginal zone eventually form?
What types of nervous fibers are found in the dorsal horn?
GVA and GSA
Spina Bifida Occulta
Mostly benign but there is not complete formation of the vertebrae
Spina Bifida Cystica
Neningocele and meningomyeloceles where there are protrusions of the spinal cord
The failure of the cephalic (rostral) neural tube to close, and results in failure of the skull to form, thus leaving the malformed brain exposed. The brain tissue typically becomes necrotic leading to anencephaly. This condition is incompatible with life, even though the brainstem often remains intact.
Abnormal accumulation of CSF within the ventricular system can lead to hydrocephaly. In newborns, it is typically due to blockage or narrowing of the aqueduct of Sylvius.
Congenital abnormality of the fourth ventricle with failure of foramens Luschka & Magendie to form, resulting in an enlargement of the fourth ventricle
It is a caudal displacement and herniation of the posterior cranial fossa structures, namely the cerebellum, through the foramen magnum.