Prenatal
Germ Layers
Postnatal
Effects of Aging
Misc.
100
Begins at conception and ends at birth
Prenatal period
100
Muscles
Mesoderm
100
Begins at birth and continues until death
Postnatal period
100
"sags"
Integumentary system
100
Process of birth
Parturition
200
Fertilized egg
Zygote
200
Epidermis
Ectoderm
200
First 4 weeks of infancy is often referred to as
Neonatal period
200
"barrel chest" develops
Respiratory system
200
The term used after the first 8 weeks of pregnancy
Fetus
300
Fertilization occurs in the
Oviduct (fallopian tubes)
300
Brain
Ectoderm
300
Extends from the end of infancy to puberty
Childhood
300
Conditions such as atherosclerosis, arteriosclerosis, and hypertension happen with this system
Cardiovascular system
300
Birth defects caused by exposure to environmental factors is called
Teratogens
400
The "bridge" between a mother and baby
Placenta
400
Tonsils
Endoderm
400
Another term used for older adulthood
Senescence
400
Conditions such as presbyopia, glaucoma, and cataracts happen with this system
Special senses
400
The term used from fertilization to the end of the eighth week of pregnancy
Embryo
500
Developing embryo that reaches a hollow ball of cells
Blastocyst
500
Gonads
Mesoderm
500
Maturation of bone & maintenance of existing body tissues occur during this postnatal period
Adulthood
500
Microscopic units decrease by 50% between the ages of 30 and 75
Urinary system
500
The process of how the primary germ layers develop into many different kinds of tissues is called
Histogenesis
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