Neural folds

Neural folds
Chick embryo of thirty-three hours’ incubation, viewed from the dorsal aspect. X 30. (Neural fold labeled at center left, third from the bottom.)
Gray's	subject #7 50
Carnegie stage	9
Precursor	neural plate
Gives rise to	neural tube

In front of the primitive streak two longitudinal ridges, caused by a folding up of the ectoderm, make their appearance, one on either side of the middle line. These are named the neural folds; they commence some little distance behind the anterior end of the embryonic disk, where they are continuous with each other, and from there gradually extend backward, one on either side of the anterior end of the primitive streak. Also, after differentiation it turns into the neural tubes.

Additional images

Longitudinal section through the embryo.

Cross section through the embryonic disc showing the fold.

External links

• Swiss embryology (from UL, UB, and UF) hdisqueembry/triderm10
• Diagram at umich.edu
• Overview at visembryo.com
• Diagram at palaeos.com

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated.