MSHS Week 5 Bio Vocab

Fusion of an egg and sperm cell

• mesoderm

• morphogenesis

• blastula

• fertilization

developing stage of a multicellular organism

• embryo

• endoderm

• fertilization

• organogenesis

The hollow ball of cells marking the end stage of cleavage during early embryonic development

• blastula

• gastrulation

• ectoderm

• zygote

fertilized egg

• zygote

• cephalogenesis

• organogenesis

• blastula

The process by which a blastula develops into a gastrula with the formation of three embryonic layers

• gastrulation

• cephalogenesis

• ectoderm

• mesoderm

the inner germ layer that develops into the lining of the digestive and respiratory systems

• endoderm

• blastula

• ectoderm

• organogenesis

middle germ layer; develops into muscles, and much of the circulatory, reproductive, and excretory systems

• mesoderm

• ectoderm

• zygote

• organogenesis

outermost germ layer; produces sense organs, nerves, and outer layer of skin

• ectoderm

• mesoderm

• archenteron

• cephalogenensis

organ formation that takes place during the first two months of prenatal development

• cephalogenesis

• endoderm

• organogenesis

• archenteron

Formation of the head in the embryonic period

• cephalogenesis

• archenteron

• morphogenesis

• zygote