posterior neuropore

cau·dal neu·ro·pore

the temporary opening at the extreme caudal end of the neural tube in early embryos; closes at approximately the 25th somite stage (that is, at about 27 days) in humans.
Synonym(s): posterior neuropore

posterior neuropore

the embryonic opening at the inferior end of the neural tube from neural canal to exterior. It closes at about the 25 somite stage, which indicates the end of horizon XII in the numeric anatomical charting of human embryonic development. Compare anterior neuropore. See also horizon.
References in periodicals archive ?
Myelomeningocele is a sacculation of the meninx and spinal cord through a vertebral defect that develops because of a closure defect of the posterior neuropore, which is the latest phase of neurulation in the third and fourth weeks of gestation.
Spina bifida with rachischisis occurs when the posterior neuropore of the neural tube fails to close during week 4 of development.
A short distance posterior to the cross-sectional level in Figure 4G, the stomochord and perihaemal coeloms disappear, and the collar cord emerges at the posterior neuropore to continue as the dorsal nerve cord of the trunk.

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