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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 - Oocyte and spermatozoa fuse at fertilization to form a zygote. Fertilization occurring generally in the first third of the uterine 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.

Image Source: Stem Cells Information, NIH USA 2006 Image © Therese Winslow

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

	Gwalagizhi	Nyangagi	Dimensions	User	Comment
current	16:18, 7 October 2015		1,000 × 747 (107 KB)	Z8600021 (talk \| contribs)
	10:02, 3 August 2009		800 × 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

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 ==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. Note the timing is only approximate, it is the sequence of events that is important to understand.
+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.
-* Day 14 of menstrual cycle - Oocyte released from ovary about the midpoint of the [[Menstrual Cycle|menstrual cycle]].
+Note the timing is only approximate, it is the sequence of events that is important to understand.
-* Day 0 - Oocyte and spermatozoa fuse at [[Fertilization|fertilization]] to form a [[Zygote|zygote]].
-* Day 1 to 3 - Cell division by mitosis forming a solid ball of cells, the [[Morula|morula]].
-* Day 3 to 5 - Cell compaction forming a fluid-filled space and two cell populations, the [[Blastocyst|blastocyst]].
--chambered conceptus (blastocyst)
+* '''Day 14 of menstrual cycle''' - Oocyte released from ovary about the midpoint of the [[Menstrual Cycle|menstrual cycle]].
+* '''Day 0''' - Oocyte and spermatozoa fuse at [[Fertilization|fertilization]] to form a [[Zygote|zygote]]. Fertilization occurring generally in the first third of the uterine tube.
+* '''Day 1 to 3''' - Cell division by mitosis forming a solid ball of cells, the [[Morula|morula]].
+* '''Day 3 to 5''' - Cell compaction forming a fluid-filled space and two cell populations, the [[Blastocyst|blastocyst]] (1-chambered conceptus).
+* '''Day 5 to 7''' - [[Blastocyst|blastocyst]] "hatches" from the surrounding [[Zona Pellucida|zona pellucida]].