the neural tube develops in a fetus by the end of the fifth month.
the neural tube develops in a fetus by the end of the fifth month.
when does the neural tube develops in a fetus?
by the end of the fifth month
neural tube









































in the developing chordate (including vertebrates), the neural tube is the embryonic precursor to the central nervous system, which is made up of the brain and spinal cord. the neural groove gradually deepens as the neural folds become elevated, and ultimately the folds meet and coalesce in the middle line and convert the groove into the closed neural tube. in humans, neural tube closure usually occurs by the fourth week of pregnancy (28th day after conception). the ectodermal wall of the tube forms the rudiment of the nervous system. the centre of the tube is the "neural canal".
neural tube
section::::development.









































the neural tube develops in two ways: "primary neurulation" and "secondary neurulation".









































primary neurulation divides the ectoderm into three cell types:









































bullet::::- the internally located neural tube









































bullet::::- the externally located epidermis









































bullet::::- the neural crest cells, which develop in the region between the neural tube and epidermis but then migrate to new locations
neural tube