Module 3 - Infancy And Toddlerhood Flashcards
It is the process of growth and development within the womb in which a single-cell zygote becomes embryo, a fetus, and then a baby
Prenatal Development
What are the stages of Prenatal Development
- Germinal Period
- Embryonic Period
- Fetal Period
This period is the first two weeks after conception
Germinal Period
Germinal Period includes:
a. Creation of Zygote
b. Continued cell division
c. The attachment of the zygote to the uterine wall
In this period, the differentiation of cells already begins as inner and outer layers of organisms are formed
Germinal Period
It is the early stage of embryo, It is the inner layer of cells that develops during the germinal period
Blastocyst
It is the outer layer of cells that develops also during the germinal period, later provides nutrition support for the embryo
Trophoblast
In this stage, the name of the mass cells, zygote becomes embryo.
Embryonic Period
In what weeks does Embryonic Period takes place
2-8 weeks after conception
What are the 3 developments that take place in Embryonic Period
a. Cell Differentiation Intensifies
b. Life-support systems for the embryo develop
c. Organ appear
how many layers of cells are formed as the zygote gets attached to the wall of Uterus
two layers of cells are formed
The embryo’s inner layer of cells that develops into the digestive and respiratory systems
Endoderm
The outer layer of the cells is divided into two parts which are the:
Ectoderm and Mesoderm
It is the outermost layer which becomes the nervous system, sensory receptors (eyes, ears, nose) and skin parts (nails, hair)
Ectoderm
Is the middle layer which becomes the circulatory, skeletal, muscular, excretory and reproductive systems
Mesoderm
It is the process of organ formation during the first two months of pre-natal development
Organogenesis
As the three layers of the Embryo form, the support systems for the embryo develop rapidly. These Life-support systems are::
• Plancenta
• Umbilical Cord
• Amnion
It contains two arteries and one vein that connects the baby to the placenta.
Umbilical Cord
Life-support system that consists of a disk-shaped group of tissues in which blood vessels from the mother and the offspring intertwine but do not join
Placenta
Is a bag or an envelope that contains a clear fluid in which the developing embryo floats.
Amnion
During this period, Growth and development continue dramatically
Fetal Period
When does the Fetal Period take place after conception?
2 months to 7 months after conception
The development process of Fetal Period are
a. 3 months after conception
b. 4 months after conception
c. 5 months after conception
d. 6 months after conception
e. 7 months after conception
d. 8 and 9 months after conception
In this time
• Fetus is about 12 inches long and weighs close to a pound
• Structures of skin (fingernails, toenails) have formed
• Fetus is more active
5 months after conception
In this time,
• Fetus is about 6 inches long and weighs 4 to 7 ounces
• Growth spurt occurs in the body’s lower parts
• Pre-natal reflexes are stronger
• Mother feels arm and leg movements for the first time
4 months after conception
In this time,
• Fetus is about 14 inches long and weighs one and half pound
• Eyes and eyelids are completely formed
• Fine layer of head covers the head
• Grasping reflex is present and irregular movements occur
6 months after conception
Fetus grows longer and gains substantial weigh, about 4 pounds
8 and 9 months after conception
In this time,
• Fetus is about 3 inches long and weighs about 1 ounce
• Fetus has become active, moves its arms and legs, opens and closes its mouth, and moves its head, the face, forehead, eyelids, nose, chin can now be distinguished and also the upper arms, lower arms, hands, and lower limbs, the genitals can now be identified as male or female.
3 months after conception
In this time, Fetus is about 16 inches long and weighs 3 pounds
7 months after conception
Is a field that investigates the causes of congential (birth) defects
Teratology