Download Germ Layers – Notes

Germ Layers – Notes
Ectoderm
- Primary germ layer in the embryo of multicellular animals that gives
rise to epidermis and nervous system.
Examples of structures:
 Brain
 Spinal Cord
 Nerves
 Outer Skin
 Eye Cup and Lens
 Nose and Ears
Mesoderm
- One of the three germ layers in triploblastic (embryos with three
primary germ layers) animals. It forms the layer of cells lying between
ectoderm and endoderm in the gastrula, and gives rise to muscle and
connective tissues. In vertebrates, it also gives rise to the blood, the
vascular system and heart, much of the kidney, and the dermis.
Examples of structures:
 Skeleton
 Muscles
 Excretory System
 Inner Skin
 Reproductive Organs
 Circulatory System
Endoderm
- Primary germ layer in the embryo of multicellular animals that gives
rise to the digestive tract, respiratory tract and associated glandular
epithelium.
Examples of structures:
 Pancreas
 Liver
 Lungs
 Lining of Digestive Tract