Unit 4 part 1 lab: fetal development

Event 1: Carnegie stage 10, which occurs after ovulation in the 21 to 23 day of a women’s cycle. This event is significant because the very beginning stages of development are starting for the eyes, ears and heart. It is a great example of how quickly that, what which was once an egg turns into a human.

Event 2: Carnegie stage 11 occurs 23-25 days after ovulation. It is the early development, which is most significant to me because it is when the building blocks for future development. Now the heart is beating, it is only the beginning; the heart is kind of practicing because the blood vessels have yet to develop. And we can now see the umbilical cord.



Event 3: Carnegie stage 16 occurs 37-42 days after ovulation. Now the brain has practically developed, specifically the part of the brain that controls the heart, breathing and muscles. The lower jaw is now visible, the hand starts to become it’s own part from the limb bud, and the thigh and foot can now be seen as a part of the leg bud.



Event 4: Carnegie stage occurs 42-44 days after ovulation. Now we’re cooking so much occurs in this stage. The heart is now separating into its four separate chambers and the diaphragm forms. The sense of smell develops in the brain, the ears are now visible and teeth begin to develop. Also the pituitary glad begins to form. It is about to decide which gender to be, and the trunk is becoming straighter preparing to become a spine.

Event 5: Carnegie stage 18 occurs 44-48 days post ovulation. The eyes develop color and the eyelid appears. Nipples are created on the chest and the kidneys start to produce urine. And the arms are ready to go.



Event 6: Carnegie stage 20 occurs 51-53 days after ovulation. Now the baby is starting to look like a human. It can now create voluntary movement, the nasal openings have formed, and the gender has been decided. The arms are full and bend at the elbow and the toes look like duck feet.

Event 7: Carnegie stage 23 occurs 56-60 days after ovulation the head is now standing up from the rest of the body. The ear is complete; the taste buds begin to form. Limbs are formed and the toes and fingers have separated. Now the tail has disappeared.



Event 8: Week 10 the baby can now be measured in inches and is about 1.25 to 1.68 inches long. The structure of the brain is complete and hair follicles start to form on the face. The baby can now make vocal sounds through the vocal cords, which have formed in the larynx. The gender organs are starting to show their gender. The nails begin to development and the skin becomes very sensitive.



Event 9: Week 12 the heart beat can now be detected. The spleen is ready to go. The gender organs are now visible and the gender of the baby can be identified. Sweet glands and hair start to grow.



Event 10: Week 16 figures prints are starting to develop. The ears are standing out from the head and are fully developed. The eyes are facing forward and the baby can now blink. I think this stage is most significant because the figure prints are developing, which are so significant in human life.



Note: I found so many stages to be significant that I did not span the whole pregnancy. I had no idea how much happened during development. I loved this assignment.