File:Week1 summary.jpg

From Embryology

Original file(1,000 × 747 pixels, file size: 107 KB, MIME type: image/jpeg)

Week 1 and 2 Human Development Overview

An overview of development of following fertilization during the first week and into the second week of development. The first week of development occurs floating freely within the uterine tube and body.

Note the timing is only approximate, it is the sequence of events that is important to understand.

  • Day 14 of menstrual cycle - Oocyte released from ovary about the midpoint of the menstrual cycle.
  • Day 0 - The haploid oocyte and spermatozoa fuse at fertilization to form a diploid zygote, the first cell. Fertilization occurring generally in the first third of the uterine tube (uterine horn, fallopian tube).
  • Day 1 to 3 - Cell division by mitosis forming a solid ball of cells, the morula.
  • Day 3 to 5 - Cell compaction forming a fluid-filled space and two cell populations, the blastocyst (1-chambered conceptus).
  • Day 5 to 7 - blastocyst "hatches" from the surrounding zona pellucida.
  • Day 7 to 9 - Implantation commences and continues through the second week of development.


Links: Week 1 | Week 2 | Lecture - Week 1 and 2 Development | Timeline human development


Week 1 Links: stage 1 | stage 2 | stage 3 | menstrual cycle | fertilization | zygote | morula | blastocyst | Lecture - Fertilization | meiosis | mitosis | Lecture - Week 1 and 2 | menstrual cycle | oocyte | spermatozoa | twinning | Genetic risk maternal age | Trisomy 21 | Trisomy 18 | Trisomy 13 | hydatidiform mole | GA week 3


Week 2 Links: stage 4 | stage 5 | stage 6 | Lecture - Week 1 and 2 | implantation | trophoblast | human chorionic gonadotropin | pregnancy test | twinning | Category:Week 2 | GA week 4

Reference

Image Source: Stem Cells Information, NIH USA 2006

Copyright

© 2001 Terese Winslow Images are for educational purposes only and cannot be reproduced electronically or in writing without permission. Terese Winslow LLC


Cite this page: Hill, M.A. (2024, June 21) Embryology Week1 summary.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Week1_summary.jpg

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

File history

Yi efo/eka'e gwa ebo wo le nyangagi wuncin ye kamina wunga tinya nan

GwalagizhiNyangagiDimensionsUserComment
current16:18, 7 October 2015Thumbnail for version as of 16:18, 7 October 20151,000 × 747 (107 KB)Z8600021 (talk | contribs)
10:02, 3 August 2009Thumbnail for version as of 10:02, 3 August 2009800 × 605 (93 KB)MarkHill (talk | contribs)Week 1 Human Development An overview of development of the 1-chambered conceptus (blastocyst) Image Source: Stem Cells Information, NIH USA 2006 Image © Therese Winslow