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uterus endometrium (loss), ovary follicle development), ovulation release of egg -
Fertilization is the fusion of haploid gametes (egg and sperm) to form the diploid zygote. -
The inner cell mass (morula) will form the entire embryo. The blastocyst consists of cells forming an outer trophoblast layer. The blastocyst stage occurs the first and second week after fertilization. -
Implantation occurs when the blastocyst attaches itself to the endometrium wall. For humans, this process begins at the end of week 1 with the most successful pregnancies implanting between 8-10 days post ovulation. Implantation continues through the second week of development. -
The three germs layers develop known as the ectoderm, the mesoderm, and the endoderm. -
By day 22 and 23, the human heart begins to beat which is the first functioning embryonic organ formed. -
The hindbrain is supplied by two parallel neural arteries. The simple ectoderm epithelium over mesenchyme, smell crest comes from nasal plates, diaphragm, and more are starting to develop and appear. -
The cochlear part of the otic vesicle elongates. -
The vibration of the maternal abdominal wall induces a startled response of the fetus. -
The thyroid TSH levels increase and the zona glomerulosa, zona fasiculata are present.