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Week 4, 26 - 30 days, 3 - 5 mm, Somite Number 21 - 29 Gestational Age {{GA}} week 6

{{BGDA Practical - Week 4 movies table}} [[File:Stage11_sem6.jpg|thumb|300px|Human embryo (Week 4, 24 days, Carnegie stage 11, 13 somite pairs)]]

Week 4, 23 - 26 days, 2.5 - 4.5 mm, Somite Number 13 - 20 Gestational Age {{GA}} - week 6

...ent during the third week (week 3) following fertilization clinical {{GA}} week 5. ...embranes and the early placenta. This page describes the mechanical events and changes occurring in each of the 3 germ layers (some concepts will also be

Week 7, 48 - 51 days, 16 - 18 mm Gestational Age {{GA}} - week 9

Week 8, 53 - 54 days, 22 - 24 mm Gestational age {{GA}} week 10

...:Week1 summary.jpg|thumb|alt=Week 1 and 2 development cartoon|300px|Week 1 and 2 development]] ...ng fertilization or clinical [[Gestational Age|gestational age]] {{GA}} '''week 3''', based upon the last menstrual period.

Week 6, 42 - 44 days, 11 - 14 mm Gestational Age {{GA}} week 8

...:Week1 summary.jpg|thumb|alt=Week 1 and 2 development cartoon|300px|Week 1 and 2 development]] ...eek 2|week 2]]) following fertilization or clinical gestational age {{GA}} week 4, base on last menstrual period.

Week 7, 44 - 48 days, 13 - 17 mm Gestational Age {{GA}} - week 9

Week 6, 37 - 42 days, 8 - 11 mm Gestational Age {{GA}} - week 8

Week 8, 51 - 53 days, 18 - 22 mm Gestational age {{GA}} week 10

...t. Note, the period from week 9 to week 38 is considered Fetal development and will be covered in detail in the [[BGDA_Practical_-_Fetal_Development|Labor [[Media:2019 BGDA Lecture - Development of the Embryo-Fetus 2.pdf|'''2019 Lecture PDF''']]

Week 4, 22 - 23 days, 2 - 3.5 mm, Somite number 4 - 12 Gestational Age {{GA}} - week 6

[[File:Stage_22_image_153.jpg|thumb|300px|Retina development ([[Week 8]] [[Carnegie stage 22|stage 22]])]] [[File:Stage_22_image_154.jpg|thumb|300px|Retina development ([[Week 8]] [[Carnegie stage 22|stage 22]])]]

[[File:Sow and piglet.jpg|thumb|Sow and piglet.]] ...production and for health issues such as obesity, cardiovascular disease, and organ transplantation (xenotransplantation).

| valign=top|[[File:Stage5 bf11L.jpg|alt=Human embryo Carnegie stage 5|400px]] | valign="top"| '''Facts:''' Week 1 - 2, size 0.1 - 0.2 mm

[[Week 1]] | [[Week 2]] | [[Zygote]] | [[Morula]] | [[Blastocyst]] | [[Implantation]] [[File:Week1_summary.jpg|thumb|450px|Week 1 and 2 Development (see [[Week 1 Movie]])]]

...ays" refer to The pull down menus below will take you to specific features and the small images are linked to pages with more specific information. For mo ...eiler Stages''' divides mouse development into 26 prenatal and 2 postnatal stages.<ref name=Theiler1972>{{Ref-Theiler1972}}</ref>

=Week 1 to 3= ...sources to study events that lead up to formation of the trilaminar embryo and early placental development. The laboratory will also begin work on the gro