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Embryonic Period (8 weeks)

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Arynn Giesbrecht

on 31 March 2014

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Transcript of Embryonic Period (8 weeks)

Embryonic Period (8 weeks)
Fetal period (30 weeks)
Development of established organs and systems
Reproductive technologies can aid or hinder
Under control of and affected by reproductive hormomes
the formation of a single cell that contains 23 chromosomes from each parent and a male and female gamete, for a total of 46 chromosomes.
Cleavage: the division of the zygote
Implantation: nesling of the blastocyst into the endometrium
The egg leaves the ovary. A single sperm nucleus enters the egg.
Fertilaztion occurs in oviduct.
Zygote undergoes cleavage to produce a morula.
Bastocyst forms and implants in the lining of the uterus.
[Diagram of sperm/egg in fertilization]
Blastocyst: the entire spherical structure
3 germ layers:
Ectoderm: outer skin, nervous tissue/ sense organs, pituitary gland, tooth enamel, adrenal medulla, eye lens
Mesoderm: dermis of skin, cellular lining of blood vessels, lymphatic vessels, body cavities, muscle tissue, adrenal cortex, kidneys/uterers, heart, spleen, internal reproductive organs
Endoderm: cellular lining of respiratory tract, digestive tract, urinary bladder, urethra, liver (most), tonsils (partial), gallbladder, parathyroid glands, pancreas, thyroid glands, thymus
Formation of the 3 primary germ layers in embryogenesis
Formation of distinct structures of a developing organism
Neurulation: The start of organ formation:
Notochord forms from mesodermon dorsal side
Neural tube starts aas a plate of ectoderm above notochord
Edges of plate fold inward, meeting to form a hollow tube surrounded by cells neu
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