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A solid ball of cells resulting from division of a fertilized ovum, and from which a blastula is formed.

Begins at the end of the embryonic stage (usually 9 weeks after fertilization) and continues until birth, during which the embryo is now called a fetus, and there is rapid growth and maturation of tissues and organs.

A fertilized egg cell that results from the union of a female gamete (egg) with a male gamete (sperm).

A phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a trilaminar (three-layered) structure known as the gastrula.

The zygote undergoes rapid mitotic cell divisions without increasing in size, leading to the formation of a multicellular embryo.

The period of extensive growth and folding of the cerebral cortex, and maturation of brain structures that will regulate vital functions and cognitive abilities.

Termination of the embryonic/fetal development stage marked by birth, followed by continued growth and development through infancy, childhood, and adolescence.

The stage where the morula develops a fluid-filled cavity becoming a blastocyst, which consists of an inner cell mass that becomes the embryo and an outer trophoblast that forms the placenta.

During this stage, neural crest cells, which are multipotent, migrate to various parts of the embryo to differentiate into a diverse range of cell types.

The development of the placenta from the trophoblast, which will establish an intricate exchange system between mother and embryo/fetus.

Begins the development of the nervous system, and the neural tube formed by neural plate folding will eventually become the brain and spinal cord.

Characterized by the development of the pharyngeal pouches, which will form structures like the lower jaw, neck, and parts of the ear and face.

The early development of limbs, where limb buds appear as small swellings that will grow and develop into arms and legs.

The stage where the heart begins to form from a simple tube-like structure that will eventually loop and differentiate into the chambers of the heart.

The creation of a protective environment within the amniotic sac, which surrounds the embryo/fetus with amniotic fluid to cushion and protect it.

The initiation of eye and ear formation, including the lens, retina, outer ear, and inner ear structures.

The process of formation of somites, which are precursors to the vertebral column, skeletal muscle, and dermis.

Maturation of the circulatory system, including the transformation of fetal circulation pathways to those that will function independently after birth.

The process by which the ectoderm, endoderm, and mesoderm develop into the internal organs of the organism.