39.4 Fertilization and Development
Terms in this set (14)
the process of a sperm joining an egg to create a zygote
the fertilized cell that undergoes cell division to produce a two-celled embryo
the process by which a cell changes from one cell type to another
a small, flagellated haploid cell that fertilizes a larger, non-motile haploid egg to form a diploid zygote
process of early development
• Early development: in the fallopian tube, zygote begins to undergo mitosis and continues to divide; cell number doubles
• Four days after fertilization, the embryo is a solid ball of about 50 cells called a morula.
• As the embryo grows, a fluid-filled cavity formed in the center, transforming the embryo into a hollow structure called a blastocyst.
• About six or seven days after fertilization, the blastocyst attaches itself to the wall of the uterus.
• The embryo secretes enzymes that digest a path into the soft tissue. This process is known as implantation.
• A cluster of cells gradually forms within the cavity of the blastocyst. This cluster sorts itself into two layers, which then produce a third layer by a process of cell migration known asgastrulation.
• The result of gastrulation is the formation of the three germ layers (endoderm, mesoderm, and ectoderm).
• Neurulation: development of organs
first stage of development? zygote begins to undergo mitosis and continues to divide, cell number doubles.
help (i know it forms the 3 germ layers tho)
development of the nervous system, occurs after gastrulation from a block of mesodermal tissue- mesodermal tissue differentiates into the notochord- as the notochord develops, neural groove changes shape and produces ridges or neural folds- the fold move together to create a neural tube where the spinal cord and rest of NS develop
gives rise to inner linings of digestive and respiratory tracts, glands
muscles and bones, blood
skin, brain, eye
the connection between mother and developing embryo
- the embryo gets oxygen and nutrients and excretes waste products through the placenta
- blood of embryo and mother do not mix because the placenta separates them
distinguish between embryo and fetus
embryo is called a fetus after 8 weeks of development. the fetus is more developed than the embryo
by what point are most of the major organs and tissues of the fetus fully formed?
after 3 months of development
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