Meclis te ask skandali 8040 b

Fetal Development

By alyk
  • Fertilization

    The sperm and ovum combine to create a zygote. This happens in the fallopian tube.
  • Period: to

    Gestational Period

  • Blastocyst Formation

    Blastocyst Formation
    At this point, the zygote has divided into a ball of cells which can be grouped into an inner core and an outer shell. The inner core will continue to develop into the feotus itself, while the outer shell will form membranes that will nourish the feotus. This is called a blastocyst. This is made from around a hundred cells.
  • Implantation

    The blastocyst implants into the endometrial lining of the uterus. (it will have left the fallopian tubes at this point.)
  • Embryo

    Blastocyst becomes embryo. Meaning cells have started to differentiate into specialised tissue cells.
  • Yolk Sac Formation

    The yolk sac serves as the source of nutrition for the feotus. It is the primative form of the curculatory system. It is essential as it is a replacement for internal circulation. WEEK 2
  • Systems Develop

    The brain, spinal chord, heart and the gastrointestinal tract starts to develop. WEEK 3
  • Limbs

    Limb buds are visible. WEEK 4-5
  • Nervous System

    The brain develops into five areas and some cranial nerves are visible. WEEK 4-5
  • Eyes and Ears

    Eyes and ears begin to form.
  • Heart beats

    The heard continues forming and now starts beating. Blood moving through main vessels. WEEK 4-5
  • Longer Limbs and Digits Forming

    The arms and legs have grown longer, and foot and hand areas can be distinguished. The hands and feet have fingers and toes (digits), but may still be webbed. WEEK 6
  • Lungs Form

    Lungs begin to form
  • Brain Continuing to develop

  • All Major Organs Starting to Develop

    WEEK 7
  • Facial Features

    Facial Features Continue to develop and ear ridge nearly finished forming. WEEK 8
  • Fetal Period

    No longer considered an ambryo, but is called a feotus.
  • Haematopoiesis

    Red blood cells are produced in the liver. WEEK 9-12
  • Gender

    Genitals appear well differentiated.
  • Movement

    The baby can make a fist with its fingers.
  • The baby begins to make active movements.

    The baby begins to make active movements, including sucking its mouth. WEEK 13-16
  • Hears

    The baby can hear
  • More Movement

    The mother can feel the feotus move.
  • Lots of hair

    Hair covers entire body, and eyelashes and eyebrows form.
  • Nails

    Nails form on toes and fingers.
  • More Hematopoeisis

    Bone marrow begins to make blood cells. WEEK 20-22
  • Fat storage

    Baby satrts storing fat. WEEK 21-23