HOW FETUS DEVELOP?
The development of a fetus, from conception to birth, is a complex and fascinating process. Here's a brief overview:
1. Conception: The development of a fetus begins with the fusion of a sperm cell from the father and an egg cell from the mother during fertilization. This forms a single cell called a zygote.
2. Cleavage: The zygote undergoes rapid cell division, forming a cluster of cells called a morula. As cell division continues, a fluid-filled cavity forms within the morula, creating a structure called a blastocyst.
3. Implantation: Around 6-7 days after fertilization, the blastocyst attaches to the uterine lining (endometrium) in a process called implantation. Once implanted, the blastocyst starts to receive nutrients from the mother's blood supply.
4. Gastrulation: This is a crucial stage where the blastocyst undergoes a process called gastrulation, which involves the formation of three primary germ layers: ectoderm, mesoderm, and endoderm. These layers will give rise to different tissues and organs in the body.
5. Organogenesis: Organogenesis refers to the development of specific organs and organ systems from the germ layers. This process begins around the third week after fertilization and continues throughout pregnancy. Major organs such as the heart, brain, lungs, liver, and kidneys begin to form during this stage.
6. Fetal development: By the end of the eighth week, the developing organism is referred to as a fetus. During the fetal period, which lasts from the ninth week until birth, the focus shifts from organ formation to growth and maturation of existing structures. The fetus undergoes significant growth in size and refinement of its organs and systems.
7. Trimesters: Pregnancy is typically divided into three trimesters, each lasting approximately three months. During the first trimester, the major organ systems develop. In the second trimester, the fetus grows rapidly, and organs continue to mature. The third trimester is characterized by further growth and preparation for birth, including brain development and lung maturation.
Throughout pregnancy, the fetus is surrounded by the amniotic sac filled with amniotic fluid, providing protection and cushioning. The placenta, which develops alongside the fetus, plays a crucial role in facilitating nutrient and waste exchange between the mother and the fetus.
It's important to note that fetal development is a dynamic process influenced by various factors, including genetic predispositions, environmental exposures, maternal health, and lifestyle choices. Regular prenatal care, including proper nutrition, prenatal vitamins, and medical check-ups, is essential for ensuring the health and well-being of both the mother and the developing fetus.
4. What is
Development of
fetus ?
Process by which a fertilized egg, or
zygote, grows and matures into a fully
formed baby within the womb during
pregnancy.
Pre-embryonic Stage
Embryonic Stage
Fetal Stage
5. Cleavage and Early Cell Division
Pre-embryonic Stage
Cleavage is a period after fertilization, when a 1-cell embryo starts developing into
a multicellular organism.
The journey begins with fertilization, where a sperm cell penetrates the egg,
resulting in the formation of a zygote.
Fertilization
also known as conception, is the process by which a sperm cell
from the male and an egg cell (ovum) from the female combine
to form a single diploid cell called a zygote.
6. Implantation
Pre-embryonic Stage
an essential early stage in conception when cells attach to the uterine wall.
Formation of Blastocyst
A blastocyst is a ball of cells that forms early in a pregnancy,
about five to six days after a sperm fertilizes an egg. It implants
in your uterine wall, eventually becoming the embryo and then
the fetus.
7. Embryonic Stage
The embryonic stage is a crucial period of prenatal development that occurs after
the fertilization of the egg and lasts until about eight weeks gestation in humans.
1. Gastrulation
Gastrulation is the process by which the single-layered blastula (the early stage
of embryonic development) transforms into a trilaminar structure called the
gastrula.
Three Germ Layers
Ectoderm
Mesoderm
Endoderm
2. Neurulation
Neurulation is a fundamental process that occurs during
embryonic development, primarily in chordates,
including humans
8. Embryonic Stage
3. Organogenesis
Organogenesis is the formation and development of the
major organs and organ systems in the embryo.
Organs and Structures
Heart
Brain and Spinal Cord
Limbs
4. Placenta Formation
placenta is an essential organ that develops during the
embryonic stage to provide oxygen, nutrients, and waste
removal for the developing embryo.
Gastrointestinal Tract
9. Embryonic Stage
5. Neural Crest Formation
It forms at the border of the neural plate and the non-neural
ectoderm during the early stages of embryonic development.
neurulation
6. Differential Growth and Regionalization
refers to the process by which various regions of an organism's body
grow at different rates and in different patterns during development.
Neural crest formation, known as
7. Establishment of Body Plan
refers to the early processes in embryonic development where the
basic layout of the organism's body is determined
10. Fetal Stage
The fetal stage, also known as fetal development or fetal period, is
the third and final stage of prenatal development.
1. Growth and Differentiation
2. Refinement of Structures
3. Movement
4. Development of Senses
5. Development of External Features
6. Placental Function
Features of this stage during fetal stage:
