Embryo Serial Sections

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Introduction

Historically, an important way of teaching embryology is by direct observation of histological sections at different stages of development. Even today the best way to observe anatomical development and relationships is by direct observation in serial sections through the embryo and fetus. The sections below are from the original teaching set prepared at UNSW that were digitized and put online in 1996 as a teaching resource.

The Stage 13 and 22 images are available in at least two formats, an unlabeled set (image 1 - 49) and a labeled set (image 50 - 98) in a rostro-caudal sequence (head to tail). Stage 22 embryo also has a set of selected images showing more detail of some organ and tissue development. In addition, there are now 3D animations based upon reconstruction of the embryos from these serial sections.

2011 - Selected slides are currently being rescanned at high resolution to show specific developmental details.

Links: stage 13 sections | Carnegie stage 13 | Movies - stage 13 | stage 22 sections stage 22 selected sections | Carnegie stage 22 | Movies - stage 22

Carnegie Stage 13

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 image 099-icon.jpg
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 serial labeled images
Stage 13 image 050.jpg Stage 13 image 051.jpg Stage 13 image 052.jpg Stage 13 image 053.jpg Stage 13 image 054.jpg Stage 13 image 055.jpg Stage 13 image 056.jpg
A1L A2L A3L A4L A5L A6L A7L
Stage 13 image 057.jpg Stage 13 image 058.jpg Stage 13 image 059.jpg Stage 13 image 060.jpg Stage 13 image 061.jpg Stage 13 image 062.jpg Stage 13 image 063.jpg
B1L B2L B3L B4L B5L B6L B7L
Stage 13 image 064.jpg Stage 13 image 065.jpg Stage 13 image 066.jpg Stage 13 image 067.jpg Stage 13 image 068.jpg Stage 13 image 069.jpg Stage 13 image 070.jpg
C1L C2L C3L C4L C5L C6L C7L
Stage 13 image 071.jpg Stage 13 image 072.jpg Stage 13 image 073.jpg Stage 13 image 074.jpg Stage 13 image 075.jpg Stage 13 image 076.jpg Stage 13 image 077.jpg
D1L D2L D3L D4L D5L D6L D7L
Stage 13 image 078.jpg Stage 13 image 079.jpg Stage 13 image 080.jpg Stage 13 image 081.jpg Stage 13 image 082.jpg Stage 13 image 083.jpg Stage 13 image 084.jpg
E1L E2L E3L E4L E5L E6L E7L
Stage 13 image 085.jpg Stage 13 image 086.jpg Stage 13 image 087.jpg Stage 13 image 088.jpg Stage 13 image 089.jpg Stage 13 image 090.jpg Stage 13 image 091.jpg
F1L F2L F3L F4L F5L F6L F7L
Stage 13 image 092.jpg Stage 13 image 093.jpg Stage 13 image 094.jpg Stage 13 image 095.jpg Stage 13 image 096.jpg Stage 13 image 097.jpg Stage 13 image 098.jpg
G1L G2L G3L G4L G5L G6L G7L


Carnegie Stage 22

Serial Sections

About Stage 22 Embryo Sections - The Carnegie stage 22 human embryo is 27mm (CRL) in size and approximately equal to day 54 - 56 of development.

Links: stage 22 serial sections | selected serial sections | Carnegie stage 22 | Embryo Serial Sections
Stage 22 image 099 icon.jpg
Stage 22 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 22 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 22L serial labeled images
Stage 22 image 050.jpg Stage 22 image 051.jpg Stage 22 image 052.jpg Stage 22 image 053.jpg Stage 22 image 054.jpg Stage 22 image 055.jpg Stage 22 image 056.jpg
A1L A2L A3L A4L A5L A6L A7L
Stage 22 image 057.jpg Stage 22 image 058.jpg Stage 22 image 059.jpg Stage 22 image 060.jpg Stage 22 image 061.jpg Stage 22 image 062.jpg Stage 22 image 063.jpg
B1L B2L B3L B4L B5L B6L B7L
Stage 22 image 064.jpg Stage 22 image 065.jpg Stage 22 image 066.jpg Stage 22 image 067.jpg Stage 22 image 068.jpg Stage 22 image 069.jpg Stage 22 image 070.jpg
C1L C2L C3L C4L C5L C6L C7L
Stage 22 image 071.jpg Stage 22 image 072.jpg Stage 22 image 073.jpg Stage 22 image 074.jpg Stage 22 image 075.jpg Stage 22 image 076.jpg Stage 22 image 077.jpg
D1L D2L D3L D4L D5L D6L D7L
Stage 22 image 078.jpg Stage 22 image 079.jpg Stage 22 image 080.jpg Stage 22 image 081.jpg Stage 22 image 082.jpg Stage 22 image 083.jpg Stage 22 image 084.jpg
E1L E2L E3L E4L E5L E6L E7L
Stage 22 image 085.jpg Stage 22 image 086.jpg Stage 22 image 087.jpg Stage 22 image 088.jpg Stage 22 image 089.jpg Stage 22 image 090.jpg Stage 22 image 091.jpg
F1L F2L F3L F4L F5L F6L F7L
Stage 22 image 092.jpg Stage 22 image 093.jpg Stage 22 image 094.jpg Stage 22 image 095.jpg Stage 22 image 096.jpg Stage 22 image 097.jpg Stage 22 image 098.jpg
G1L G2L G3L G4L G5L G6L G7L


Selected Serial Sections

About Stage 22 Embryo Sections - The Carnegie stage 22 human embryo is 27 mm (CRL) in size and approximately equal to day 54 - 56 of development (week 8). These images have been selected to show some key features of late embryo development.

Links: Carnegie stage 22 - selected serial sections‎‎ | Carnegie stage 22 - serial sections | Carnegie stage 22 | Embryo Serial Sections
Stage 22 image 099 icon.jpg
Stage 22 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 22 Serial labeled images

A1L  A2L  A3L  A4L  A5L  A6L  A7L

B1L  B2L  B3L  B4L  B4L  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 22 selected serial labeled images
Stage 22 image 150.jpg Stage 22 image 151.jpg Stage 22 image 152.jpg Stage 22 image 153.jpg Stage 22 image 154.jpg Stage 22 image 155.jpg Stage 22 image 156.jpg
A1 head and brain A2 cortex A3 eye A4 optic nerve A5 retina A6 lens A7 CN5 and endocrine
Stage 22 image 157.jpg Stage 22 image 158.jpg Stage 22 image 159.jpg Stage 22 image 160.jpg Stage 22 image 161.jpg Stage 22 image 162.jpg Stage 22 image 163.jpg
B1 CN5 trigeminal B2 pituitary B3 auditory B4 choroid plexus B5 membranous labyrinth B6 inner ear B7 neck
Stage 22 image 164.jpg Stage 22 image 165.jpg Stage 22 image 166.jpg Stage 22 image 167.jpg Stage 22 image 168.jpg Stage 22 image 169.jpg Stage 22 image 170.jpg
C1 neck cartilages C2 pharynx C3 trachea and thyroid C4 trachea and esophagus C5 thorax C6 thymus C7 thorax
Stage 22 image 171.jpg Stage 22 image 172.jpg Stage 22 image 173.jpg Stage 22 image 174.jpg Stage 22 image 175.jpg Stage 22 image 176.jpg Stage 22 image 177.jpg
D1 lung D2 trunk D3 foot D4 cardiac inflow D5 coronary sinus D6 spinal cord D7 heart
Stage 22 image 178.jpg Stage 22 image 179.jpg Stage 22 image 180.jpg Stage 22 image 181.jpg Stage 22 image 182.jpg Stage 22 image 183.jpg Stage 22 image 184.jpg
E1 atrial septum E2 atrial septum E3 liver E4 hepatic structure E5 hepatic vessel E6 gastrointestinal E7 duodenum
Stage 22 image 185.jpg Stage 22 image 186.jpg Stage 22 image 187.jpg Stage 22 image 188.jpg Stage 22 image 189.jpg Stage 22 image 190.jpg Stage 22 image 191.jpg
F1 gastrointestinal F2 pancreas F3 adrenal gland F4 kidney F5 renal pelvis F6 nephron F7 gonad
Stage 22 image 192.jpg Stage 22 image 193.jpg Stage 22 image 194.jpg Stage 22 image 195.jpg Stage 22 image 196.jpg Stage 22 image 197.jpg Stage 22 image 198.jpg
G1 ureter G2 mesonephros G3 testis G4 rete tesits G5 urogenital G6 urogenital G7 urogenital


Animations - Stage 13

Movies - Embryo Carnegie stage 13 - These embryo animations rotate and show the relative position of internal systems at about the middle of embryonic development. Compare these with the later stage 22 embryos.The movies are based upon reconstruction of serial slice images.


Stage13-ALL-icon.jpg
 ‎‎Systems
Page | Play
Stage13-GIT-icon.jpg
 ‎‎GIT Stage 13
Page | Play
Stage13-CVS-icon.jpg
 ‎‎Cardiovascular
Page | Play
Stage13-CNS-icon.jpg
 ‎‎Stage 13 Neural
Page | Play

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).

Animations - Stage 22

Movies - Embryo Carnegie stage 22 - These embryo animations rotate and show the relative position of internal systems at the end of embryonic development. Compare these with the earlier stage 13 embryos. The movies are based upon reconstruction of serial slice images.


Stage22 ALL3d.jpg
 ‎‎Systems
Page | Play
Stage22-GIT-icon.jpg
 ‎‎GIT Stage 22
Page | Play
Stage22-CVS-icon.jpg
 ‎‎Cardiovascular
Page | Play
Stage22-CNS-icon.jpg
 ‎‎Stage 22 Neural
Page | Play
Stage22-CNS-icon.jpg
 ‎‎Urogenital
Page | Play
Stage22-CNS-icon.jpg
 ‎‎Skeletal
Page | Play

These 3d movies were part of the UNSW Medical degree Independent Learning Project (ILP) prepared by Aashish Kumar (2006).


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Cite this page: Hill, M.A. (2019, October 22) Embryology Embryo Serial Sections. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Embryo_Serial_Sections

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© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G