Carnegie stage 21: Difference between revisions

Revision as of 12:36, 4 September 2009

Facts: Week 8, 53 - 54 days, 22 - 24 mm

View: Lateral view. Amniotic membrane removed.

Features: scalp vascular plexus, eylid, eye, nose, auricle of external ear, arm, elbow, wrist, knee, notch between digital rays, umbilical cord

Identify: straightening of trunk, pigmented eye, eyelid, nose, external acoustic meatus, scalp vascular plexus, webbed digits, liver prominance, thigh, ankle, foot plate, umbilical cord

Events Ectoderm: sensory placodes, nasal pits moved ventrally, fourth ventricle of brain

Mesoderm: heart prominence, ossification continues

Head: nose, eye, external acoustic meatus

Body:straightening of trunk, heart, liver, umbilical cord

Limb: upper limbs longer and bent at elbow, foot plate with digital rays begin to separate, wrist, hand plate with webbed digits

Image source: Embryology page Created: 19.03.1999

Introduction

Facts

Events

Features

Carnegie Stages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | About Stages | Timeline

Bright Field

Kyoto Collection

View: This is a dorsolateral view of embryo. Amniotic membrane removed.

Image source: Embryology page Created: 19.03.1999

Carnegie Stages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | About Stages | Timeline

Image source: The Kyoto Collection images are reproduced with the permission of Prof. Kohei Shiota and Prof. Shigehito Yamada, Anatomy and Developmental Biology, Kyoto University Graduate School of Medicine, Kyoto, Japan for educational purposes only and cannot be reproduced electronically or in writing without permission.

Cite this page: Hill, M.A. (2024, May 2) Embryology Carnegie stage 21. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_21

What Links Here?

@@ Line 23: / Line 23: @@
-===Carnegie Stages Link===
+== Introduction ==
-[[Carnegie_stage_1|1]] | [[Carnegie_stage_3|3]] | [[Carnegie_stage_7|7]] | [[Carnegie_stage_8|8]] | [[Carnegie_stage_9|9]] | [[Carnegie_stage_10|10]] | [[Carnegie_stage_11|11]] | [[Carnegie_stage_12|12]] | [[Carnegie_stage_13|13]] | [[Carnegie_stage_14|14]] | [[Carnegie_stage_15|15]] | [[Carnegie_stage_16|16]] | [[Carnegie_stage_17|17]] | [[Carnegie_stage_18|18]] | [[Carnegie_stage_19|19]] | [[Carnegie_stage_20|20]] | [[Carnegie_stage_21|21]] | [[Carnegie_stage_22|22]] | [[Carnegie_stage_23|23]]
-== About Carnegie Stages ==
-Carnegie stages are named after the famous US Institute which began collecting and classifying embryos in the early 1900's. Stages are based on the external and/or internal morphological development of the embryo, and are not directly dependent on either age or size. The human embryonic period proper is divided into 23 Carnegie stages. Carnegie stages are based on the external and/or internal morphological development of the embryo, and are not directly dependent on either age or size. Criteria beyond morphological features include age in days, number of somites present, and embryonic length.
+===Facts===
-The Kyoto Collection images are reproduced with the permission of '''Prof. Kohei Shiota'''. Scanning electron micrographs of the Carnegie stages of the early human embryos are reproduced with the permission of '''Prof Kathy Sulik'''. Images are for educational tutorial/revision purposes and cannot be reproduced electronically or in writing without permission.
-== UNSW Embryology Links ==
+===Events===
-* [http://embryology.med.unsw.edu.au/wwwhuman/Stages/stage21.htm Embryology Carnegie stage 21 Created: 19.03.1999]
-* [http://embryology.med.unsw.edu.au/wwwhuman/Stages/carnegie.htm About the Carnegie Institute]
-===Glossary Links===
-[[A|A]]  | [[B|B]] | [[C|C]] | [[D|D]] | [[E|E]] | [[F|F]] | [[G|G]] | [[H|H]] | [[I|I]] | [[J|J]] | [[K|K]] | [[L|L]] | [[M|M]] | [[N|N]] | [[O|O]] | [[P|P]] | [[Q|Q]] | [[R|R]] | [[S|S]] | [[T|T]] | [[U|U]] | [[V|V]] | [[W|W]] | [[X|X]] | [[Y|Y]] | [[Z|Z]]
-:Dr Mark Hill 2009, '''''UNSW Embryology''''' ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
+===Features===
+{{Template:Carnegie_stages}}
+== Bright Field ==
+==Kyoto Collection==
+View: This is a dorsolateral view of embryo. Amniotic membrane removed.
+Image source: [http://embryology.med.unsw.edu.au/wwwhuman/Stages/stage15.htm Embryology page Created: 19.03.1999]
+{{Template:Carnegie_stages}}
+{{Kyoto collection}}
+{{Template:Footer}}
 [[Category:Human Embryo]] [[Category:Carnegie Stage]] [[Category:Week 8]]