Title: Anatomy / figures

cartilage (left to right):
hyaline
elastic
fibrous

circulatory system
left: after birth
right: fetus

oblique = schräg

Between red and purple there is NO air but fluid to allow for movement. If air would get in between, the lungs would collapse.

hypophysis - endocrine system

Essential wall structure of the intestinal tube
1. mucosa
2. submucosa (shifting layer)
3. submucosal plexus MEISSNER (nerve system)
4. circular muscularis (part of two layer: 4 and 6)
5. myenteric plexus AUERBACH (nerve system in muscular layer)
6. longitudinal muscularis (part of two layer: 4 and 6)
7. peritoneum (serosa)
Each of the organs helping with digestion have this wall structure! It originated from the fetal ingestive tube.