A Long time ago, in a bed room far far away...... THIS HAPPENED

Censored

OH! That was awesome.

.....Alright

Following Daddy’s big finish he releases millions of potential you’s. The mini you’s swim up Mommy’s fallopian tube until they meet your future apartment for the next 9 months.

Ah!

Fertilizing Sperm

Polar Body

FIMBRIA (supplies nutrients to the

uterus

Fallopian Tube (carries the egg from the oviduct to the uterus

Ovary (produces sex hormones and eggs)

Note that the sperm cells are oversized in this diagram, the

egg is actually 1000 times larger then any sperm

Sperm Nucleus

Egg Nucleus

Fallopian Tube

Once the sperm has successfully made its way into the egg, it will now add its 23 chromosomes with the other 23 chromosomes contained in the egg nucleus.

Fusion of Egg and Sperm cell

Cell Division begins(Cleavage)

Zygote- the zygote receives 23

chromosomes from the sperm cell and 23 chromosomes from

the oocyte

Morula (approx. Day3. cells are packed tightly

together)

In the first 0-1.5 weeks of the first trimester the zygote divides multiple times and then implants

itself in the uterus.

Blastocyst (contains a mass of undifferentiated

cells. Approx. Day 5)

The blastocyst implants itself along the wall of the uterus(endometrium) so it can further develop

Endometrium

Uterus (provides a place for the egg to

develop

EmbryoblastBlastocyst

cavity

Trophoblast

trophoblast

Forming yolk sac

Amniotic cavity

Endometrium (blastocyst implants

and develops on wall)

Enlarged blood vesselsForming

Chorion

Ectoderm Amniotic cavity

Yolk Sac

Connecting stalk

Mesoderm

Endoderm (yellow)

Note: this process does not happen as quickly as presented in

slide.

Allontis

Umbillical cord

Placenta (allows nutrient uptake

and waste removal

Eyes, ears internal organs and extremities begin to develop and

form over the next few weeks.

In week 8-10 joints begin to form the baby has begun movement. Average size is .9 inches and the

weight is .07 ounces

Week 12-Nearly all the organs are formed and have started to function. Fingers and toes are now not webbed. Gonads start

differentiate and start to form because of the x and y chromosomes. Hormones that are circulating in the blood also determine the outward characteristics of the fetus. If too much

estrogen is present in a male then he will develop female physical traits. This begins in week 8.

Second Trimester (weeks14-20)- sex now distinguishable, heart-beat can be heard. Movement is now recognized and brain has developed so that it swallow, suck and make irregular breathing

movements. A fine hair is now covering the whole body.

Week 28-32: the baby is capable of surviving outside the uterus if lungs can breath properly. There is a 10%- 20% survival if born at

week 28. at week 32 the survival rate goes up to 50%. The average size is 41 cm long, and 1680 g.

Week 30- 40: the baby is the same size as the placenta, and there is a 94% chance of survival is born at the 36th week. The full term

baby is an average size of 51 cm long and 3400 g in weight

Placenta

Role of Hormones• Estrogen- responsible for the formation of liver, lung, kidney, and adrenal

glands. It also helps in the development of sexual traits, helps in the process of lactation, regulates bone density and helps blood flow between the mother and the baby

• Progesteron- it helps maintain the role of the placenta, protects form any damaging cells, prevents sudden uterine contractions until the baby is fully developed and prevents lactation until the baby is born

• Oxytocin- helps the uterus contract and stimulates the mammary glands to produce milk.

• HGC- stimulates the production of estrogen and progesterone which keeps the body from releasing another egg. This stops menstruation and keeps the fertilized egg in the uterus.