File:Kollmann344.jpg

Fig. 344. Mouth opening and its boundary in a human embryo of 19-20 days

As seen from the side (lateral view) Original magnification 20x (After Rabl.)

There are already visible gills, where the separation of the mandibular arc into an upper and lower jaw protrusion emerges very clearly. The size of the gill arch decreases from first to third. The place where the eye emerges later is identified as a small bump. A lens plate has not yet been created.

This text is a Google translate computer generated translation and may contain many errors.

Images from - Atlas of the Development of Man (Volume 2)

(Handatlas der entwicklungsgeschichte des menschen)

Kollmann Atlas 2: Gastrointestinal | Respiratory | Urogenital | Cardiovascular | Neural | Integumentary | Smell | Vision | Hearing | Kollmann Atlas 1 | Kollmann Atlas 2 | Julius Kollmann

Links: Julius Kollman | Atlas Vol.1 | Atlas Vol.2 | Embryology History

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

Kollmann JKE. Atlas of the Development of Man (Handatlas der entwicklungsgeschichte des menschen). (1907) Vol.1 and Vol. 2. Jena, Gustav Fischer. (1898).

Cite this page: Hill, M.A. (2024, April 26) Embryology Kollmann344.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Kollmann344.jpg

What Links Here?

© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

Fig. 344. Mundöffnun; und deren Umgrenzung bei einem menschlichen Embryo von 19—20 Tagen, von der Seite gesehen. Vergr. 20 mal. (Nach Rabl.)

Es sind schon Kiemenbogen erkennbar, wobei die Trennung des Mandibular- bogens in einen Ober- und Unterkieferfortsatz besonders deutlich hervortritt. Die Größe der Kiemenbogen nimmt vom ersten bis dritten ab. Die Stelle, wo das Auge später hervortritt, ist als eine kleine Erhebung kenntlich. Eine Linsen- platte ist noch nicht angelegt.