from fertilization to childbirth | 3d medical animation | by Dandelion Team

during ejaculation nearly 300 million sperms move from the testes through the tubes called the vas deferens into the area of the prostate at this point the prostate contracts closing off the opening between the bladder and the urethra releasing fluid into the urethra and pushing semen on through the seminal forms a thick fluid that is alkaline in order to protect sperm from the acidic environment of the female vagina the gel is liquefied by enzymes from the prostate gland it also contains sugars to nourish the sperm the seminal plasma is left in the vagina sperm use their tails to swim through the layers of cervical mucus that guard the entrance to the uterus during ovulation this barrier becomes thinner and changes its acidity creating a friendlier environment for the sperm on the other side after releasing the egg at about day 14 of the period the egg arrives at a specific portion of the tube called the ambular ismic junction it rests for another 30 hours fertilization occurs in this portion of the tube once the sperm has entered the uterus contractions propel the sperm upward into the fallopian tubes to meet the waiting egg sperm must travel from the vagina to the fallopian tubes a tough journey that few sperm survive this process may be nature's way of allowing only the healthiest sperm to fertilize the egg to provide the best chances of having a healthy baby the first sperm enter the tubes a few minutes after ejaculation but however the first sperm are not likely to fertilize the egg modal sperm can survive in the female reproductive tract for up to five days the magic happens in the fallopian tubes the fallopian tube pushes the egg towards the uterus cilia push the sperm towards the egg also the surrounding cells of the egg produce a chemical that attracts sperm the sperm first burrowed through the cells of the corona radiata then upon contact with the zona pellucida the sperm bind to the receptors in the zona pellucida then the enzyme-filled cap of the sperm called the acrosome releases its stored digestive enzymes finally the sperm must fuse with the egg plasma membrane this event causes the egg membrane to change and prevent other sperm from attaching to it now attached the sperm's nucleus where the chromosomes are stored enters the egg cell looking for the eggs nucleus egg combines genetic material with a sperm to create a full set of chromosomal dna with 23 pairs of chromosomes that contain a unique copy of half the genes of the parent source this is the blueprint for a whole new unique person that instantly determines gender hair color eye color and many other characteristics the combined sperm and egg is called a zygote it is the earliest developmental stage it divides rapidly in the days following fertilization [Music] the zygote then travels down the fallopian tube to the uterus [Music] after fertilization the zygote continues to divide and morph into a blastocyst ball of 16 cells approximately five to six days after fertilization it is smaller than the tip of a ballpoint pen only 20 percent to 30 percent of fertilized eggs will reach the blastocyst stage embryos that survive this stage of development have a high implantation potential once transferred into the uterine cavity the blastocyst hatches out of its shell and burrow into the uterine wall endometria which serves as the source of oxygen and nutrients about four weeks from the beginning of the last period near the next period the blastocyst has begun to produce the pregnancy hormone to tell your ovaries to stop releasing eggs from then on the menstrual cycle pauses the blastocyst is called an embryo now home pregnancy tests might be able to get a positive result at week five the circulatory system brain and spinal cord are beginning to form and the tiny heart will start to beat the baby's heart beats about 54 million times before birth the placenta provides oxygen and nutrients to the growing baby and removes waste products from the baby's blood via the umbilical cord the nose mouth and ears are starting to shape at week six at weeks seven and eight the embryo has doubled in size since last week's little hands and feet start to grow at week 9 to 12 a pregnancy the embryo is called a fetus the baby is almost fully formed and has completed the most critical portions the facial features are more recognizable the fetus's head is rotated and bent towards the chest and he can occasionally touch his face the diaphragm muscles start to grow the reproductive circulatory and urinary systems are all at an advanced stage of development the fetus will urinate in the amniotic sac it is a sign of the proper functioning of the fetus's body if the baby is a girl her ovaries contain millions of eggs if the fetus is a boy his testicles will already start producing testosterone male sex hormone which is necessary for the development of his reproductive system she or he is about five centimeters in size and 14 grams in weight she or he is growing and maturing until ready to birth [Music] [Music] [Music] you

Channel: Dandelion Medical Animation

Views: 15,853,669

Keywords: animation, 3d medical animation, dandelionteam, Embryos, from fertilisation, fertilization, fertilisation (literature subject), egg and sperm fertilization, cervical mucus, cervical mucus in early pregnancy, cervical mucus after ovulation, ovulation symptoms, ovulation, fallopian tube anatomy, medical, normal delivery, medical animations, birth, labor, birth animation, mechanism of labour, labor and delivery, birth vlog, baby delivery vlog, baby delivery animation vlog, baby delivery

Id: s-Xpa5UZAZs

Length: 9min 51sec (591 seconds)

Published: Thu May 12 2022