Question

How are the three germ layers formed?

Answer 1

Germ layers:

1. Germ layers refer to the primary layers formed during embryonic development.
2. The majority of living organisms have three germ layers - endoderm, mesoderm, and ectoderm.
3. These layers are crucial as they coordinate and function to develop new organs for the growing embryo.
4. They are formed during the gastrulation stage of embryonic development.
5. The cells migrating inward along the primary axis of the embryo is the inner layer of the gastrula and develop into the endoderm.
6. Some of the cells moving towards the primary axis but at a slower rate give rise to the mesoderm.
7. Once the mesoderm is formed, the remaining epiblast cells form the ectodermal layer.
8. The outer layer of the embryo is termed ectoderm.
9. The endoderm develops into the esophagus, stomach, intestines, bladder, and lungs while the mesoderm develops and forms the bone, cartilage, connective tissues, lymphatic system, and skin.
10. The ectoderm gives rise to the brain, spinal cord, pituitary, motor neurons, and retina.