Notochord formation and neuralation - 2

zainaboshodi's version from 2015-04-20 18:56


Question Answer
At around what day does the cranial neuropore close?17-20
At around what day does the posterior neuropore close?: 26-29
What occurs in primary neuralation?:Folding and midline fusion of the neural plate, the tube is then covered by surface ectoderm which forms most of the spinal cord.
What occurs in secondary neuralation?Remnants of the retreating primitive streak forms the tailbud. Mesenchymal cells of the tail bud form the 2nd neural tube. The lumen is continuous with that of the neural tube.
What is anencphaly?When the vault of the skull doesn't close properly and a malformed brain is left exposed.
What is the prevalence of spina bifida?1 in 2000 live births.
How is spina bifida detected prenatally?Increased alpha-feroprotein is present.
What is the recommended dose of folic acid for those attempting to get pregnant and throughout pregnancy?400ug per day