Module
8
Icon module 8
Embryonic phase

Synoptic table of the Carnegie stages 7 - 10

Stage 7
Approx. 19th day: Dorsal view
0.4 mm
media/module8/carnegie/i1_kyotostad07.jpg

1
Yolk sac
2
Primitive streak
3
Primitive node
4
Embryonic disk

Fig. synopimg7

Characteristic signs

  • Mesoblast immigration.

  • Chordal process.

  • Neural plate.

  • Genesis of the blood vessel system and formation of blood.

© Professor Kohei Shiota, Kyoto University

Stage 8
Approx. 23th day
0.5 - 1.5mm
media/module8/carnegie/i1_kyotostad08.jpg

1
Body stalk
2
Primitive streak
3
Embryonic disk
4
Cut edge of the amnion

Fig. synopimg8

Characteristic signs

  • Pear shaped embryo.

  • Axial process.

  • Neurenteric canal.

  • Neural groove forming.

© Professor Kohei Shiota, Kyoto University

Stage 9
Approx. 25th day
1.5 - 2.5 mm
media/module8/carnegie/i1_kyotostad09sml.jpg

1
Primitive streak and primitive groove
2
Neural folds
3
Cut edge of the amnion

media/module8/carnegie/h2nb_neurulation_synop.gif

4
Neural groove
5
Somites

Fig. synopimg9a, synopimg9b

Characteristic signs

  • Embryo with somites (1-3 somites).

  • Pharyngeal membrane.

  • Neural groove.

  • Caudal eminence.

  • Intraembryonic coelom.

  • Cardiac primordium, septum transversum.

  • Placode and auditory pit.

© Professor Kohei Shiota, Kyoto University

Fig. synopimg9b
Stage 10a, 10b
Approx. 28th day
2 - 3.5 mm
media/module8/carnegie/i1_kyotostad10asml.jpg

1
Cut edge of the amnion
2a
Neural groove
3
Neural folds
4
Somites

media/module8/carnegie/i1_kyotostad10bsml.jpg

2b
Neural tube
2c
Caudal neuropore
2d
Rostral neuropore
5
Yolk sac

Fig. synopimg10a, synopimg10b

Characteristic signs

  • Lateral folding.

  • Closure of the neural groove into a neural tube.

  • The 2 first pharyngeal arches appear.

  • Ophthalmic vesicle .

  • Rupture of the pharyngeal membrane.

  • 4-12 somites.

© Professor Kohei Shiota, Kyoto University

Fig. synopimg10b