File:Patten040.jpg: Difference between revisions

Latest revision as of 09:00, 29 July 2011

Fig. 40. Dextral view of entire chick embryo of 41 somites

(about four days incubation)

The cranial and cervical flexures which appeared in embryos during the second day have increased so that in three-day and four-day chicks the long axis of the embryo shows nearly right-angled bends in the mid-brain and in the neck region. The mid-body region of thee-day chicks is shghtly concaved dorsally. This is due to the fact that the embryo is still broadly attached to the yolk in that region. By the end of the fourth day the body folds have undercut the embryo so it remains attached to the yolk only by a slender stalk. The yolk-stalk soon becomes elongated allowing the embryo to become first straight in the mid-dorsal region, and then convex dorsally. At the same time the caudal flexure is becoming more pronounced. The progressive increase in the cranial, cervical, dorsal, and caudal flexures results in the bending of the embryo on itself so that its originally straight long-axis becomes C-shaped and its head and tail lie close together (Fig. 40).

Historic Disclaimer - information about historic embryology pages
Pages where the terms "Historic" (textbooks, papers, people, recommendations) 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, interpretations and recommendations 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. (2024, April 27) Embryology Patten040.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Patten040.jpg

What Links Here?

File history

Click on a date/time to view the file as it appeared at that time.

	Date/Time	Thumbnail	Dimensions	User	Comment
current	02:02, 17 January 2011		802 × 758 (189 KB)	S8600021 (talk \| contribs)	{{Template:Patten_1920_Figures}}

You cannot overwrite this file.

File usage

The following 2 pages use this file:

@@ Line 1: / Line 1: @@
+==Fig. 40. Dextral view of entire chick embryo of 41 somites==
+(about four days incubation)
+The cranial and cervical flexures which appeared in embryos during the second day have increased so that in three-day and four-day chicks the long axis of the embryo shows nearly right-angled bends in the mid-brain and in the neck region. The mid-body region of thee-day chicks is shghtly concaved dorsally. This is due to the fact that the embryo is still broadly attached to the yolk in that region. By the end of the fourth day the body folds have undercut the embryo so it remains attached to the yolk only by a slender stalk. The yolk-stalk soon becomes elongated allowing the embryo to become first straight in the mid-dorsal region, and then convex dorsally. At the same time the caudal flexure is becoming more pronounced. The progressive increase in the cranial, cervical, dorsal, and caudal flexures results in the bending of the embryo on itself so that its originally straight long-axis becomes C-shaped and its head and tail lie close together (Fig. 40).
 {{Template:Patten_1920_Figures}}