Embryo aged 4 weeks
Numéro d’image : 11874859
| The human embryo after 28 days (4 weeks) development,with the head at left. Most of the primitive organ systems are formed: the embryonic heart is already beating. The embryo's curved appearance is due to the symmetrical growth of the brain,which now comprises 5 divisions. The spinal cord becomes thickened on the underside,forming clusters of nerve cells: these unite with the upper & lower sides of the neural canal to form spinal nerves which connect with other organs as they are formed. Lungs bud in a branching manner,forming bronchi,bronchioles & finally air sacs. Glands such as the thyroid,pancreas,thymus & parathyroid arise from the primitive gut | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Edelmann |
| Taille de l’image : | 3822 px × 2513 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : |
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