Module
8
Icon module 8
Embryonic phase

Synoptic table of the Carnegie stages 17 - 19

Stage 17
Approx. 41rst day
11 - 14 mm
media/module8/carnegie/i1_kyotostad17.jpg

  1. Umbilical cord with physiologic umbilical hernia
  2. Nasal pit
  3. Pigmented lens placode
  4. External acoustic meatus
  5. Auricular hillocks
  6. Formation of the interdigital zones

Fig. synopimg17

Characteristic signs

  • External acoustic meatus.

  • The circumference of the head increases.

  • The trunk lengthens.

  • Fusion of the 6 auricular hillocks.

  • Atrophy of the embryonic tail.

  • Formation of the interdigital zones.

© Professor Kohei Shiota, Kyoto University

Stage 18
Approx. 44th day
13 - 17 mm
media/module8/carnegie/i1_kyotostad18.jpg

  1. Cardiac prominence
  2. Nasolacrimal groove
  3. External acoustic meatus
  4. Hand plate with visible finger radiations
  5. Footplate with toe primordium
  6. Primordium of the palpebra (eyelid)

Fig. synopimg18

Characteristic signs

  • Palpebra primordium.

  • Toe primordium.

  • Nasal primordium.

  • The elbow joint forms.

  • Gonadal gender can be determined in male embryos.

© Professor Kohei Shiota, Kyoto University

Stage 19
Approx. 46th day
16 - 18 mm
media/module8/carnegie/i1_kyotostad19.jpg

  1. Liver prominence
  2. Primordium of the eyelid
  3. Eye
  4. External acoustic meatus
  5. Shoulder
  6. Finger
  7. Toes that are forming
  8. Straightening of the trunk

Fig. synopimg19

Characteristic signs

  • Lengthening and straightening of the torso.

  • Appearance of the external acoustic meatus.

  • Genesis of the hip and knee joints.

  • Atrophied embryonic tail.

  • Rupture of the cloacal membrane.

  • Maxilla and mandibula.

© Professor Kohei Shiota, Kyoto University