EVERYDAY SCIENCE

Detailed explanation-1: -The ectoderm gives rise to the skin and the nervous system. The mesoderm specifies the development of several cell types such as bone, muscle, and connective tissue.

Detailed explanation-2: -The embryonic germ layer that lies between Ectoderm and Endoderm and which gives rise to the mesenchyme, which consists of the connective tissue, muscles and bones of the body.

Detailed explanation-3: -Gastrulation occurs during week 3 of human development. The process of gastrulation generates the three primary germ layers (ectoderm, endoderm, mesoderm), which primes the system for organogenesis and is one of the most critical steps of development.

Detailed explanation-4: -A third, middle layer of cells called the mesoderm is formed as cells begin to populate the space between the endoderm and the ectoderm. These three layers, the endoderm, the ectoderm and the mesoderm, are called the primary germ layers.