What does the ectoderm form?

Answer 1

The Ectoderm is the start of a tissue that covers the body surfaces. It emerges first and forms from the outermost of the germ layers.

The Ectoderm forms: the central nervous system, the lens of the eye, cranial and sensory, the ganglia and nerves, pigment cells, head connective tissues, the epidermis, hair, and mammary glands

Answer 2

At the beginning of week three after fertilization the embryo is in the the form of a bilaminar disc with the epiblast layer on top, continuous with the amniotic cavity and the hypoblast layer below, continuous with the yolk sac. Gastrulation is process by which this bilaminar (2 layer) disc becomes three germ layers: the endoderm, the mesoderm and the ectoderm. The primitive streak forms from a thickened band of epiblast cells. These cells proliferate and migrate in between the two layers. It is therefore the primitive streak which forms the mesoderm (middle layer). The epiblast layer is now the embryonic ectoderm and the hypoblast layer is the embryonic endoderm.

Answer 3

The ectoderm forms the skin, hair, nails, and nervous system in developing embryos. It also gives rise to structures like the brain and spinal cord.

Answer 4

The middle embryonic germ layer, lying between the ectoderm and the endoderm, from which connective tissue, muscle, bone, and the urogenital and circulatory systems develop.

Answer 5

lining of the digestive tract,endocrine glands, and lungs.

Answer 6

A mesoderm is one of the three tissue layers in the embryo of an animal, alongside the ectoderm and the endoderm.

Answer 7

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