5 Weeks
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At five weeks of pregnancy, the embryo is rapidly changing. Gestational and yolk sacs develop around the embryo to protect and nourish it until the placenta takes over [1]. The umbilical cord is also growing [1].
The embryo now has three layers of cells that will form its different structures and organs:
● The endoderm (inner layer) will develop into the respiratory and digestive systems [2].
● The mesoderm (middle layer) will develop into the circulatory, skeletal, and muscular systems [1].
● The ectoderm (outer layer) will develop into the nervous system, hair, nails, and skin [1,2].
Ultrasonography can now detect most pregnancies [3].
References:
1. Betts JG, Young KA, Wise JA, Johnson E, Poe B, Kruse DH, et al. 28.2 Embryonic Development. Anatomy & Physiology. Houston: OpenStax; 2013.
2. Harms R, Wick M, editors. Mayo Clinic Guide to a Healthy Pregnancy. Boston: Da Capo Press; 2011.
3. Moore KL, Persaud TVN, Torchia MG. The Developing Human: Clinically Oriented Embryology. Philadelphia: Elsevier; 2016.
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Produced and written by: Samantha Lattof, PhD MSc
Medically reviewed by: Ayodeji Olelakan Abere, MD MBA MHA
Animation by: SciePro / Pond5
Music by: audiomarket / Pond5
Narration by: Ava at Wellsaid