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Early in embryonic development, during the 3rd week post-fertilization, the embryo is a flat, disc-shaped organism made up of three layers of pluripotent cells called germ layers, which give rise to all the organs and tissues in the body. Find our complete video library only on Osmosis Prime: Hundreds of thousands of current & future clinicians learn by Osmosis. We have unparalleled tools and materials to prepare you to succeed in school, on board exams, and as a future clinician. Sign up for a free trial at Subscribe to our Youtube channel at Get early access to our upcoming video releases, practice questions, giveaways, and more when you follow us on social media: Facebook: Twitter: Instagram: Our Vision: Everyone who cares for someone will learn by Osmosis. Our Mission: To empower the world’s clinicians and caregivers with the best learning experience possible. Learn more here: Medical disclaimer: Knowledge Diffusion Inc (DBA Osmosis) does not provide medical advice. Osmosis and the content available on Osmosis's properties (, YouTube, and other channels) do not provide a diagnosis or other recommendation for treatment and are not a substitute for the professional judgment of a healthcare professional in diagnosis and treatment of any person or animal. The determination of the need for medical services and the types of healthcare to be provided to a patient are decisions that should be made only by a physician or other licensed health care provider. Always seek the advice of a physician or other qualified healthcare provider with any questions you have regarding a medical condition. Find our full video library only on Osmosis: Join millions of current and future clinicians who learn by Osmosis, along with hundreds of universities around the world who partner with Osmosis from Elseiver to make medical and health education more engaging and efficient. We have unparalleled tools and materials to prepare you for success in school, on your board exams, and as a future clinician. Sign up for a free trial at If you're interested in exploring an institutional partnership, visit to request a personalized demo. Follow us on social: Facebook: Twitter: Instagram for med: Instagram for nursing: TikTok: Linkedin: Our Vision: Everyone who cares for someone will learn by Osmosis. Our Mission: To empower the world’s clinicians and caregivers with the best learning experience possible. Learn more here: Medical disclaimer: Osmosis from Elsevier does not provide medical advice. Osmosis from Elsevier and the content available on the Osmosis from Elsevier properties (, YouTube, and other channels) do not provide a diagnosis or other recommendation for treatment and are not a substitute for the professional judgment of a healthcare professional in diagnosis and treatment of any person or animal. The determination of the need for medical services and the types of healthcare to be provided to a patient are decisions that should be made only by a physician or other licensed healthcare provider. Always seek the advice of a physician or other qualified healthcare professional with any questions you have regarding a medical condition. © 2024 Elsevier. All rights reserved.
