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See also [[Carnegie stage 13#Events|'''Carnegie stage 13 Events''']] {{Carnegie stage 13 links}}

| valign="bottom"|{{Embryo stage movie 1}} Human blastocyst week 1 movies, 3 above movies together in single table.

...ecting surface and internal development. [[:File:Stage13_sem1.jpg|Carnegie stage 13]] | valign="bottom"|{{Stage 23 MRI movie 5}}

==Carnegie Stages== Historic [[Carnegie Stages]] 10 to 13.

...and table of [[Fetal_Development#Carnegie_Fetal|Carnegie embryos at fetal stage]]. ...dded video recordings of 2016 lectures on [[Template:Science Lecture movie table|Neural Crest, Head and Musculoskeletal development]].

* Stage 13 - Week 4, 26 - 30 days, 3 - 5 mm, Somite Number 21 - 29 The table below shows a thumbnail view of each section and a brief description of rel

==Stage 21== {{Carnegie Collection stage 21 table}}

See also [[Carnegie stage 14#Events|'''Carnegie stage 14 Events''']] {{Carnegie stage 14 links}}

==Stage 22== {{Carnegie Collection stage 22 table}}

There are 2 Carnegie stages that show external embryo development during this week. File:Stage16_bf1.jpg|[[Carnegie stage 16|Stage 16]]

| [[File:Stage7-sem2.jpg|250px|link=Carnegie stage 7]] | [[File:Stage8_SEM1.jpg|250px|link=Carnegie stage 8]]

==Carnegie Stages== Historic [[Carnegie Stages]] 1 to 4.

Human embryonic stage 9 occurs during week 3 between 19 to 21 days. ...tes have begun to form and number between 1 to 3 somite pairs during this stage.

==Human Carnegie Stages== | Carnegie stages are named after the famous USA institute which began collecting and

==Carnegie Stage 12 to 14== [[Carnegie_stage_11|Stage 11]]

...es can also be classified by the same [[Carnegie Stage Comparison|Carnegie stage system]]. {{Mouse Rat Pig table}}

...ate:Carnegie_stages|Template:Carnegie_stages]]- menu link to each Carnegie stage page. * [[Template:Carnegie stage table|Template:Carnegie stage table]] - table of Carnegie stages with brief descriptions and links to stages.

==Stage 1== [[Carnegie stage 1]]

See also [[Carnegie stage 16#Events|'''Carnegie stage 16 Events''']] {{Carnegie stage 16 links}}

...pment). Rat development is also generally 1 day behind that of mouse. (The table below gives details relating to the staging of rat development). * Standard Witschi Stage 1, day 1 , Size (mm) 0.07