The endoderm gives rise to the epithelium of the digestive system and respiratory system, and organs associated with the digestive system, such as the liver and pancreas. The mesoderm gives rise to many cell types such as muscle, bone, and connective tissue.
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| Gastrulation | |
|---|---|
| MeSH | D054262 |
| Anatomical terminology | |
Which organ develops and is fully functional in the first trimester?
The neural tube (which becomes the brain and spinal cord), the digestive system, and the heart and circulatory system begin to form. The beginnings of the eyes and ears are developing.
During which prenatal developmental period do the mesoderm ectoderm and endoderm form?
Within the first 8 weeks of gestation, a developing embryo establishes the rudimentary structures of all of its organs and tissues from the ectoderm, mesoderm, and endoderm. This process is called organogenesis.
What is the last organ to develop in a fetus?
Almost all organs are completely formed by about 10 weeks after fertilization (which equals 12 weeks of pregnancy). The exceptions are the brain and spinal cord, which continue to form and develop throughout pregnancy. Most malformations (birth defects) occur during the period when organs are forming.
During which stage of prenatal development does breathing movement begin?
Fetal breathing movements begin around week 20 or 21, and occur when contractions of the respiratory muscles cause the fetus to inhale and exhale amniotic fluid. These movements continue until birth and may help to tone the muscles in preparation for breathing after birth and are a sign of good health.
What happens during the 9 months of pregnancy?
The growing fetus places more and more strain on your body when you’re 9 months pregnant. Common pregnancy symptoms at this time may continue through the end of pregnancy. These symptoms include fatigue, trouble sleeping, trouble holding urine, shortness of breath, varicose veins, and stretch marks.
Levels of Organization
Describe the main function of the major organs.
The 11 Major Organ Systems & Their Functions
Main Function of the Major Organs (Science 4 Quarte2 Week1)
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