Carnegie stage 13

Introduction

Facts

Week 4-5, 26 - 30 days, 3 - 5 mm, Somite Number 21 - 29

Events

Ectoderm: Neural tube continues to close, Caudal neuropore closes, forebrain

Mesoderm: continued segmentation of paraxial mesoderm (21 - 29 somite pairs), heart prominence

Head: 1st, 2nd and 3rd pharyngeal arch, forebrain, site of lens placode, site of otic placode, stomodeum

Body:

heart, liver, umbilical, early upper limb bulge

Features

day 26, 27 somites, forebrain, site of lens placode, site of otic placode , stomodeum, 1st pharyngeal arch, 2nd pharyngeal arch, 3rd pharyngeal arch, heart prominence, somites

Identify: forebrain, site of lens placode, site of otic placode, stomodeum, 1st pharyngeal arch, 2nd pharyngeal arch, 3rd pharyngeal arch, heart prominence, somite

Carnegie Stage 13 Movies: Gastrointestinal Tract | Cardiovascular | Central Nervous System | Carnegie Stage 13 | Stage 22 Movies | Movies

The original animations were part of the UNSW Independent Learning Project (ILP) prepared by Aashish Kumar (2006).

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

Scanning EM

Kyoto Collection

Image source: Embryology page Created: 19.03.1999

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.

Stage 13 Serial Section Images

These are the original serial images prepared from embryo sections for Embryology practical classes and transferred online in 1996.

Links: Carnegie stage 13 - serial sections | Carnegie stage 22 - serial sections | Carnegie stage 22

Labeled Sections

Stage 13 serial labeled images

A1L	A2L	A3L	A4L	A5L	A6L	A7L
B1L	B2L	B3L	B4L	B5L	B6L	B7L
C1L	C2L	C3L	C4L	C5L	C6L	C7L
D1L	D2L	D3L	D4L	D5L	D6L	D7L
E1L	E2L	E3L	E4L	E5L	E6L	E7L
F1L	F2L	F3L	F4L	F5L	F6L	F7L
G1L	G2L	G3L	G4L	G5L	G6L	G7L

Unlabeled Sections

Stage 13 serial unlabeled images

A1	A2	A3	A4	A5	A6	A7
B1	B2	B3	B4	B5	B6	B7
C1	C2	C3	C4	C5	C6	C7
D1	D2	D3	D4	D5	D6	D7
E1	E2	E3	E4	E5	E6	E7
F1	F2	F3	F4	F5	F6	F7
G1	G2	G3	G4	G5	G6	G7

Stage 13 Movies

Gastrointestinal	Cardiovascular	Central Nervous System

Additional Images

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  Stage 13 crown rump length

• 

  Stage 13 surface bulges

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  Stage 13 otocyst

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  Stage 13 caudal trunk

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  Cross-section showing neural tube, notochord, limb bud

• 

  Selected image of above cross-section showing neural tube, notochord, limb bud

• 

  Historic - Human embryo with twenty-seven primitive segments (7 mm., 26 days)

• 

  Historic - Human embryo with 28 primitive segments (7.5 mm)

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: Scanning electron micrographs of the Carnegie stages of the early human embryos are reproduced with the permission of Prof Kathy Sulik, from embryos collected by Dr. Vekemans and Tania Attié-Bitach. Images are for educational purposes only and cannot be reproduced electronically or in writing without permission.

Embryonic Development

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Cite this page: Hill, M.A. (2024, May 3) Embryology Carnegie stage 13. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_13

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