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Biology

Human Development

TermDefinition
Ovulation The release of a mature egg from the ovary into one of the Fallopian tubes.
Fertilization The fusion of a sperm and egg cell. *Only one sperm cell can successfully break through the egg's protective barrier.
Zygote A fertilized egg. An embryo is formed.
Cleavage or Mitosis Cellular division occuring over 6 to 7 days. cells double in number and decrease in size.
Blastocyst A hollow ball of cells (approximatley 64 cells).
Implantation When the blastocyst attaches to the wall of the uterus and begins to grow into the tissues of the mother.
Differentiation The process in which cells become specialized in structure and function.
Gastrulation Cell migration and development resulting in the formation of 3 cell-germ layers: ectoderm, endoderm, and mesoderm
Ectoderm Outer-most germ layer; will develop into the skin and nervous system.
Endoderm Inner-most germ layer; will develop into organs of the digestive system and respiratory system.
Mesoderm Middle germ layer; will develop into muscles, bones, blood cells, and gonads.
Neurulation The first step in the development of the nervous system; the ectoderm layer develops into the brain and spinal cord.
Placenta The connecting organ between mother and embryo; source of respiration nourishment and excretion for the embryo
Embryo Early development stage of a multicellular organism.
Fetus A human embryo after 8 weeks of development (2 months).
Created by: megmezzoprete