What is the time from conception to birth called?

Gestation is the period of time between conception and birth when a baby grows and develops inside the mother’s womb.

What is the stage defined as before birth?

Prenatal development is the process that occurs during the 40 weeks prior to the birth of a child, and is heavily influenced by genetics.

What is the pregnancy stage called?

Overview. A typical pregnancy lasts 40 weeks from the first day of your last menstrual period (LMP) to the birth of the baby. It is divided into three stages, called trimesters: first trimester, second trimester, and third trimester. The fetus undergoes many changes throughout maturation.

What are the four stages of conception?

The stages of fertilization can be divided into four processes: 1) sperm preparation, 2) sperm-egg recognition and binding, 3) sperm-egg fusion and 4) fusion of sperm and egg pronuclei and activation of the zygote.

What are the 4 stages of embryonic development?

  • 1.1 Fertilization.
  • 1.2 Cleavage.
  • 1.3 Blastulation.
  • 1.4 Implantation.
  • 1.5 Embryonic disc.

What is a blastocyst?

Three days after fertilization, a normally developing embryo will contain about six to 10 cells. By the fifth or sixth day, the fertilized egg is known as a blastocyst — a rapidly dividing ball of cells. The inner group of cells will become the embryo. The outer group will become the cells that nourish and protect it.

What are the 3 stages of pregnancy?

Pregnancy the three trimesters
  • First Trimester (0 to 13 Weeks) The first trimester is the most crucial to your baby’s development. …
  • Second Trimester (14 to 26 Weeks) …
  • Third Trimester (27 to 40 Weeks)

What are the labor stages?

The first stage of labor is the longest and involves three phases:
  • Early Labor: The onset of labor until the cervix is dilated to 3-6 centimeters.
  • Active Labor Phase: Continues from 3 cm until the cervix is dilated to 7 centimeters.
  • Transition Phase – Continues from 7 cm until the cervix is fully dilated to 10 centimeters.

What is the difference between a blastocyst and blastula?

blastocyst, a distinctive stage of a mammalian embryo. It is a form of blastula that develops from a berrylike cluster of cells, the morula. … The blastocyst differs from the blastula in that it is composed of two already differentiated cell types, the inner cell mass and the enveloping layer.

What is the blastocyst stage?

What is a blastocyst? The word ‘blastocyst’ refers to the stage that the human embryo reaches approximately five to six days after fertilisation (Fig. 1). Figure 1: A blastocyst stage embryo. The embryo must reach this stage before it can hatch and implant in the lining of the uterus.

What is the difference between a blastocyst and an embryo?

The key difference between the blastocyst and the embryo is in the developmental stage in which they are formed. The blastocyst is formed at the blastula stage, whereas the embryo is formed when the blastocyst is implanted in the uterine wall.

What does the blastula develop into?

The cells of the blastula form an epithelial (covering) layer, called the blastoderm, enclosing a fluid-filled cavity, the blastocoel. … After the blastula develops, it undergoes transition to the gastrula (q.v.), a process called gastrulation.

How long is the blastula stage?

BLASTULA PERIOD (2 1/4 – 5 1/4 h) We use the term blastula to refer to the period when the blastodisc begins to look ball-like, at the 128-cell stage, or 8th zygotic cell cycle, and until the time of onset of gastrulation, ca. cycle 14.

What is the name of the blastula stage in humans?

blastocyst
In mammals, the blastula is referred to as a blastocyst. The blastocyst contains an embryoblast (or inner cell mass) that will eventually give rise to the definitive structures of the fetus, and a trophoblast which goes on to form the extra-embryonic tissues.

What is the blastula stage of an embryo?

An early stage of embryonic development in animals. It is produced by cleavage of a fertilized ovum and consists of a spherical layer of around 128 cells surrounding a central fluid-filled cavity called the blastocoel. The blastula follows the morula and precedes the gastrula in the developmental sequence.

What happens in blastula stage?

In mammals, the blastula forms the blastocyst in the next stage of development. Here the cells in the blastula arrange themselves in two layers: the inner cell mass, and an outer layer called the trophoblast. The inner cell mass is also known as the embryoblast and this mass of cells will go on to form the embryo.

What is morula stage?

A morula (Latin, morus: mulberry) is an early-stage embryo consisting of 16 cells (called blastomeres) in a solid ball contained within the zona pellucida.

What is the 8 cell stage?

The 8-cell stage is a period in embryonic development when the conceptus has undergone 3 cleavages from a single cell, resulting in 8 cells. In some mammals, it is at this stage of development that the individual cells begin to adhere tightly, a process called compaction.

How many stages are there in embryonic development?

three
This union marks the beginning of the prenatal period, which in humans encompasses three distinct stages: (1) the pre-embryonic stage, the first two weeks of development, which is a period of cell division and initial differentiation (cell maturation), (2) the embryonic period, or period of organogenesis, which lasts …