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Embryo test 5

what does the nervous systme develope from the neural plate
formation of the nervous system is induced by ________ formation and ______ ______ notochord (forms ventral to neural tube); paraxial mesoderm
what is neurulation the proccess of formation of the neural plate, the neural folds, and their closure to form the neural tube
when is neurulation completed? by the end of the fourth week, when closure of the caudal neuropore occurs
what is the embryo referred as in neurulation? neurula
As the notochord develops, the embryonic ______ over it thickens to form te neural plate which is induced by the developing notochord ectoderm
what does ectoderm (neuroectoderm) give rise to? the central nervous system, consisting of the brain and spinal cord
where does thee neural plate first appear? cranial to the primitive node and dorsal to the notochord process and the mesoderm adjacent to it
as the notochord forms and elongates what happens to the neural plate it broadens and eventually extends cranially as far as the oropharyngeal membrane
when does the neural plate invaginate along its central axis to form a neural groove that has neural folds on each side? 18th day
when doe the neural folds begin to move together and fuse, converting the neural plate into a neural tube? end of 3rd week
what happens after the neural tube separates from the surface ectoderm? the free edges of the surface ectoderm fuse so that this layer becomes continuous over the back of the embryo. Surface ectoderm differentiates into the epidermis of the skin
fusion of folds of the neural tube proceed in the ______ and ______ directions until only small areas remain open on both ends cranial and caudal
when does the rostral neuropore close 24 days
when does the posterior neuropore close 2 days after the rostral neuropore (26 days)
what does the cranial two-thirds of neural plate develop into? the brain
what does the caudal one-third of neural plate develop into? spinal cord
before closure, the _______ of the neural tube- neural canal- communicates freely with amniotic cavity lumen
closure of neuropores coincides with establishment of a ______ ______ _____ for neural tube blood vascular circulation
the neural canal is converted into the _____ _____ of brain and ____ ____ ____ of spinal cord ventricular system; central canal system
the sacral and coccygeal segments of the spinal cord (and corresponding dorsal and ventral roots) are formed by _______ _______ secondary neurulation
secondary neurulation begins on day _____ and is completed by day ______ 20; 42
A cell mass called the ______ _______ appears caudal to the neural tube. It enlarges and cavitates and joins the neural tube caudal eminence
as the neural folds fuse some neuroectodermal celly lying along the crest of each neural fold lose their epithelial affinities and attachments to neighboring cells. these cells are called what? neural crest cells
As the neural tube separates from the surface ectoderm neural crest cells migrate _________ on each side of the neural tube ventrolaterally
_____ _____ is formed by neural crest cells that form an irregular flattened mass between the neural tube and the overlying surface ectoderm neural crest
the neural crest cells soon separates into right and left parts that migrate to the ___________ aspects of the brain and spinal cord dorsolateral
separated neural crest cell's migratio to dorsolateral aspects of the brain and spinal cord give rise to what? dorsal root gang, sympathetic gang, enteric gang, parasym gang of CN 7,9, and 10, schwann cells (myelinated PNS), satellite cells of peripeheral gang, cartilage of phary arches, ciliary & papillary musc, chromafin cells of adrenal medulla, & leptomeninges
what is Hirschprung disease (congenital megacolon)? failure of neural crest to migrate and form enteric ganglia to lower bowel
what is Familial dystautonomia problem with neural crest development and migration
what are the sensory symptoms of familial dystautonomia? impaired pain and temperature perception
what are the motor symptoms of Familial dystautonomia impaired autonomic symptoms (cardiovascular instability and gastrointestinal dysfunction)
what are placodes specialized epidermal cells (head region)
placodes join neural crest to form sensory ganglia of which cranial nerves 5, 7, 8, 9, and 10
Olfactory placodes differentiate into _________ ______ that give rise to the olfactory nerve (CN 1) and induce the formation of ______ ________ neurosensory cells; olfactory bulbs
Created by: jacquess17