 |
| Previous Image | Next Image |
| Description: At about 4 weeks after fertilization, the head end of the neural tube develops into three enlarged areas called primary brain vesicles. Picture Stats: Views: 168 Filesize: 349.92kB Height: 560 Width: 874 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40506 |