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Fig. 37. Drawings from transverse sections to show origin of neural crest cells

The location of the area drawn is indicated on the small sketch to the left of each drawing.

A anterior rhombencephalic region of 30-hour chick

B posterior rhombencephalic region of 36-hour chick

C mid-dorsal region of cord in 55-hour chick.

The neural crest should not be confused with the margin of the neural fold with which it is associated before the closure of the neural tube. The margin of the neural fold involves cells which go into the superficial ectoderm and into the neural tube, as well as those which are concerned in the formation of the neural crest.

When first established the neural crest is continuous anteroposteriorly. As development proceeds, the cells of the neural crest migrate ventro-laterally on either side of the spinal cord (Fig. 37, C), and at the same time become segmen tally clustered. The segmen tally arranged cell groups thus derived from the neural crest give rise to the dorsal root ganglia of the spinal nerves, and in the head region to the ganglia of the sensory cranial nerves.

(For a later stage of the dorsal root ganglia see Figure 44.)


Links: Introduction | Gametes and Fertilization | Segmentation | Entoderm | Primitive Streak and Mesoderm | Primitive Streak to Somites | 24 Hours | 24 to 33 Hours | 33 to 39 Hours | 40 to 50 Hours | Extra-embryonic Membranes | 50 to 55 Hours | Day 3 to 4 | References | All Figures
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Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms and interpretations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Reference

Patten BM. The Early Embryology of the Chick. (1920) Philadelphia: P. Blakiston's Son and Co.


Cite this page: Hill, M.A. (2019, August 26) Embryology Patten037.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Patten037.jpg

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© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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