Module
8
Icon module 8
Embryonic phase

Synoptic table of the Carnegie stages 11 - 13

Stage 11
Approx. 29th day
2.5 - 4.5 mm
media/module8/carnegie/i1_kyotostad11_sml.jpg

  1. Neural tube
  2. Neuroporus caudalis
  3. Rostral neuropore
    that is just closing
  4. Somites
  5. 2nd pharyngeal arch
  6. 1rst pharyngeal arch

media/module8/carnegie/h2nd_neurulation_synop.gif

3
Cranial neuropore
4
Somites
2
Caudal neuropore

Fig. synopimg11a, synopimg11b

Characteristic signs

  • Closure of the rostral neuropore.

  • Nasal placode.

  • Ophthalmic vesicle.

  • Auditory pit.

  • 13 - 20 somites.

© Professor Kohei Shiota, Kyoto University

Fig. synopimg11b
Stage 12
Approx. 30th day
3 - 5 mm
media/module8/carnegie/i1_kyotostad12.jpg

1a
Maxillar process
1b
Mandibular process
2
Second pharyngeal arch
3
Third pharyngeal arch
4
Somites
5
Neural tube
6
Heart
P
Prosencephalon (forebrain)
M
 Mesencephalon (midbrain)
R
Rhombencephalon (hindbrain)

Fig. synopimg12

Characteristic signs

  • Closure of the caudal neuropore.

  • Third pharyngeal arch.

  • Buds of the upper extremities.

  • Cervical sinus.

  • 21 - 29 somites.

© Professor Kohei Shiota, Kyoto University

Stage 13
Approx. 32th day
4 - 6 mm
media/module8/carnegie/i1_kyotostad13.jpg

1a
Maxillary process
1b
Mandibular process
2
Second pharyngeal arch
3
Third pharyngeal arch
4
Fourth pharyngeal arch
5
Somites
6
Buds of the upper extremities
7
Left cardiac ventricle
8
Left cardiac atrium
9
Body stalk
10
Embryonic tail

Fig. synopimg13

Characteristic signs

  • Buds of the lower extremities.

  • Lens placode.

  • Auditory pit.

  • Fourth pharyngeal arch.

  • More than 30 somites.

© Professor Kohei Shiota, Kyoto University