At what time after fertilization does neural tube formation take place, and which stage of craniofacial development does it represent?

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Between 18 and 23 days after fertilization; it is the second phase of craniofacial developmentFrom 28 to 38 days post fertilization; it marks the third phase of craniofacial developmentBetween 42 and 55 days after fertilization; representing the fourth phase of craniofacial developmentOn day 17 after fertilization; it is the initial phase of craniofacial developmentNot applicable

Explanation

Neural tube formation occurs between 18 and 23 days following fertilization and corresponds to the second stage in the sequence of craniofacial development. Other stages occur later, such as the third stage between 28 and 38 days, the fourth stage from 42 to 55 days, and the first stage on day 17.