Human embryonic development or human embryogenesis is the development and formation of the human embryo. It is characterised by the processes of cell division...

is the initial stage of development for a multicellular organism. In organisms that reproduce sexually, embryonic development is the part of the life...

biology, animal embryonic development, also known as animal embryogenesis, is the developmental stage of an animal embryo. Embryonic development starts with...

cap, and cotyledons. Unlike the embryonic development in animals, and specifically in humans, plant embryonic development results in an immature form of...

identical process occurs in other species. Human embryonic development refers to the development and formation of the human embryo. It is characterised by the...

In human embryonic development, a pre-embryo is a conceptus before implantation in the uterus. The word pre-embryo sometimes is used in ethical contexts...

the third week of development, the embryonic ectoderm forms a thickened strip called the neural plate. By the fourth week of development the neural plate...

The development of the secondary palate commences in the sixth week of human embryonic development. It is characterised by the formation of two palatal...

years, and has been subjected to surgical and cosmetic alterations. The human ear consists of three parts—the outer ear, middle ear and inner ear. The...

add fluid to semen during ejaculation (pre-ejaculate). The embryonic and prenatal development of the male reproductive system is the process whereby the...

Prenatal development starts with fertilization, in the germinal stage of embryonic development, and continues in fetal development until birth. In human pregnancy...

on early human development, certain genetic disease, and in vitro toxicology testing. According to a 2002 article in PNAS, "Human embryonic stem cells...

bilaminar embryonic disc, bilaminar blastoderm or embryonic disc is the distinct two-layered structure of cells formed in an embryo. In the development of the...

cells make up the inner cell mass during the blastocyst stage of embryonic development, around days 5–14. These have stem-cell capability. In vivo, they...

ectoderm—the outermost tissue layer of the embryo. In the third week of human embryonic development the neuroectoderm appears and forms the neural plate along the...

fertilized egg called a zygote, initiating embryonic development. Scientists discovered the dynamics of human fertilization in the 19th century. The process...

menstruation. Embryonic age: Week nr 1. 0 (whole) weeks old. 1–7 days from fertilization. Fertilization of the ovum to form a new human organism, the human zygote...

Tooth development or odontogenesis is the complex process by which teeth form from embryonic cells, grow, and erupt into the mouth. For human teeth to...

The development of the reproductive system is the part of embryonic growth that results in the sex organs and contributes to sexual differentiation. Due...

eight-cell stage. Cleavage is holoblastic and rotational. In human embryonic development at the eight-cell stage, having undergone three cleavages the...

(1831–1904), who had developed a rival "causal-mechanical theory" of human embryonic development. His's work specifically criticised Haeckel's methodology, arguing...

palate. During the fifth week of human embryonic development the placodes increase in size. In the sixth week of development the centre of each placode grows...

conductive hearing loss, deafness. Ear development begins in about the third week of human embryonic development, beginning with the formation of the otic...

pregnancy can vary by up to 37 days. Embryonic development in the human covers the first eight weeks of development; at the beginning of the ninth week...

Implantation, also known as nidation, is the stage in the mammalian embryonic development in which the blastocyst hatches, attaches, adheres, and invades...

Science claiming to have successfully harvested pluripotent, embryonic stem cells from a cloned human blastocyst using SCNT techniques. Hwang claimed to have...

(TE), though yolk sac is far more widely used. In humans, the yolk sac is important in early embryonic blood supply, and much of it is incorporated into...

2002, he narrated Life's Greatest Miracle, a documentary about human embryonic development. That same year Lithgow returned to Broadway portraying J.J....

of animals, from the earliest stages of embryonic development to adulthood. The field of neural development draws on both neuroscience and developmental...

young, and use of alcohol or tobacco. During the fourth week of human embryonic development, the lateral body wall folds of the embryo meet at the midline...