Carnegie stage 13

Introduction

Facts

Week 4, 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

Stage 13 Serial Section Images

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

About Stage 13 Embryo Sections - This image is from a serial section of a 6mm CRL pig embryo with some features of the Stage 14 embryo. This embryo is approximately equal to the day 42 human embryo. Use these serial images to identify internal features and relationships that exist within the embryo at this stage. Then compare these images with the later features of the Carnegie stage 22 human embryo.

Links: Carnegie stage 13 - serial sections | Carnegie stage 13 | Embryo Serial 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

Embryo 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

Stage 13 Movies

Gastrointestinal	Cardiovascular	Central Nervous System

Additional Images

• 

  Stage 13 crown rump length

• 

  Stage 13 surface bulges

• 

  Stage 13 otocyst

• 

  Cross-section showing neural tube, notochord, limb bud

• 

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

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

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.

---

Cite this page: Hill, M.A. (2024, June 26) Embryology Carnegie stage 13. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Carnegie_stage_13

What Links Here?

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