Conception To 8 Weeks
- 1. Conception to 8 Weeks NU304B Spring 2009 Meagan Bamba Ada, Mary Joy Aparicio, Kat Arcala, Mary Ann Bartonico, Christine Bernardo
- 20. Human Chorionic Gonadotropin Released in response to fertilization Detected 2 weeks after conception Prevents mother's immune system from attacking embryo Prevents menstruation Maintains level of progesterone Marker for pregnancy tests
- 21. 2 nd - 3 rd Week: Primitive Streak A primitive streak is seen during process of differentiation when cells migrate across the surface of the embryo to form the 3 primary germ layers.
- 22. 2 nd - 3 rd Week: ECTODERM Develops into the skin, hair, nails, nose, ears, mouth, teeth, anal canal, sensory organs, the lenses of the eyes, the retina, brain, and the nervous system.
- 23. 2 nd - 3 rd Week: MESODERM Develops into the muscles, bones, cartilage, lining of the blood vessels, kidney, heart, lungs, reproductive, circulatory and excretory systems
- 24. 2 nd - 3 rd Week: ENDODERM Develops into the inner lining of the digestive tract, surface lining of the respiratory passages, trachea, tongue, urethra, bladder and pancreas
- 25. 2 nd - 3 rd Week: Organ Systems Length : 2 mm from crown to rump Width : Head end is wider than tail end, with a slightly narrowed middle GI System : Liver begins to function Respiratory System : Nasal pits forming Endocrine System : Thyroid tissue appears Eyes : The optic cup and lens pit have formed, pigment in eyes Ears : Auditory pit is now an enclosed structure Cardiovascular : Tubular heart begins to form, blood begins to circulate and by the end of the third week, the heart begins to beat and can be detected on ultrasound!
- 26. Fetal Development 3 weeks: The embryonic disc becomes elongated and pear-shaped to form a long cylindrical tube called nortochord for brain and spinal cord development. Basically, the beginning of a body. Heart and kidneys begins to form. Liver begins to function. 4 weeks: Anterior portion of neural tube closes to form brain and posterior portion forms spinal cord. Tubular heart begins beating at a regular rhythm and starts pushing its own primitive blood cells through the main blood vessels by the end of 28 days. Oral cavity and stomach begins to form. 5 weeks: Brain has differentiated into 5 areas and 10 pairs of cranial nerves are present Division of the atrium occurs Maternal Changes Breast feels full; tenderness and tingling feeling occurs in the nipples Urinate more often Nausea and vomiting occurs; gum tissue becomes hyperemic and softens and may bleed when only mildly traumatized May be tired, due to hormonal changes and/or anemia (lack of iron)
- 27. 6 Weeks
- 28. 7 Weeks
- 29. 8 Weeks