𝟎𝟓. 𝐒𝐞𝐜𝐨𝐧𝐝 𝐰𝐞𝐞𝐤 𝐨𝐟 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 2️⃣ 🧬 (التطور الجنينى فى الأسبوع الثانى)

"𝗧𝗵𝗶𝘀 𝘃𝗶𝗱𝗲𝗼 𝗲𝘅𝗽𝗹𝗮𝗶𝗻𝘀 𝗵𝗼𝘄 𝘁𝗵𝗲 𝘁𝘄𝗼 𝗹𝗮𝘆𝗲𝗿𝘀 𝗼𝗳 𝘁𝗵𝗲 𝘁𝗿𝗼𝗽𝗵𝗼𝗯𝗹𝗮𝘀𝘁 𝗱𝗶𝗳𝗳𝗲𝗿𝗲𝗻𝘁𝗶𝗮𝘁𝗲, 𝗹𝗲𝗮𝗱𝗶𝗻𝗴 𝘁𝗼 𝘁𝗵𝗲 𝗳𝗼𝗿𝗺𝗮𝘁𝗶𝗼𝗻 𝗼𝗳 𝘁𝗵𝗲 𝗯𝗶𝗹𝗮𝗺𝗶𝗻𝗮𝗿 𝗴𝗲𝗿𝗺 𝗱𝗶𝘀𝗰, 𝘁𝘄𝗼 𝗰𝗮𝘃𝗶𝘁𝗶𝗲𝘀 (𝗮𝗺𝗻𝗶𝗼𝘁𝗶𝗰 𝗮𝗻𝗱 𝘆𝗼𝗹𝗸 𝘀𝗮𝗰 𝗰𝗮𝘃𝗶𝘁𝗶𝗲𝘀), 𝗮𝗻𝗱 𝘁𝗵𝗲 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 𝗼𝗳 𝘁𝗵𝗲 𝗲𝘅𝘁𝗿𝗮𝗲𝗺𝗯𝗿𝘆𝗼𝗻𝗶𝗰 𝗺𝗲𝘀𝗼𝗱𝗲𝗿𝗺 𝗮𝗻𝗱 𝗲𝘅𝘁𝗿𝗮𝗲𝗺𝗯𝗿𝘆𝗼𝗻𝗶𝗰 𝗰𝗼𝗲𝗹𝗼𝗺." 𝐂𝐡𝐚𝐩𝐭𝐞𝐫𝐬 (𝐭𝐢𝐦𝐞𝐬𝐭𝐚𝐦𝐩𝐬)💡الفصول (الطوابع الزمنية) 00:00 - Intro (مقدمة) 00:22 - Content (المحتوى) 00:22 - Changes occur during the second week of development 00:22 - Differentiation of the two layers of the trophoblast 00:22 - Formation of bilaminar germ disc 00:22 - Formation of the amniotic sac & yolk sac 00:22 - Formation of extraembryonic mesoderm 00:22 - MCQ 00:22 - Practical questions 𝐌𝐂𝐐: 💪 👋 1. Which two layers that form the bilaminar embryonic disc? A. Epiblast and mesoderm B. Epiblast and hypoblast C. Ectoderm and endoderm D. Mesoderm and endoderm 2. Which of the following occurs during the first week of development? A. Fertilization and formation of blastocyst B. Gastrulation C. Neural tube formation D. Organogenesis 3. What is the main event during the second week of pregnancy? A. Gastrulation B. Neural crest formation C. Formation of bilaminar germ disc D. Limb bud appearance 4. The floor of the amniotic cavity is formed of which of the following structures? A. Hypoblast B. Extraembryonic mesoderm C. Epiblast D. Trophoblast 5. Which of the following structures forms the roof of the amniotic cavity? A. Ectoderm B. Mesoderm C. Endoderm D. Amniotic membrane 6. What is the main embryological event that characterizes the second week of development? A. Formation of trilaminar disc B. Formation of notochord C. Formation of bilaminar germ disc D. Neural tube closure 7. What is the name of the cavity that forms within the epiblast during the second week? A. Chorionic cavity B. Amniotic cavity C. Yolk sac D. Neural canal 8. Which structure gives rise to the amnion? A. Cytotrophoblast B. Syncytiotrophoblast C. Epiblast D. Hypoblast 9. Which cells invade the maternal endometrium during implantation? A. Epiblast cells B. Cytotrophoblasts C. Syncytiotrophoblasts D. Hypoblast cells 10. The primary yolk sac is derived from which layer? A. Epiblast B. Syncytiotrophoblast C. Cytotrophoblast D. Hypoblast 11. Which cavity appears in the extraembryonic mesoderm during the second week? A. Chorionic cavity B. Amniotic cavity C. Primitive streak D. Neural canal 12. Which of the following structures surrounds the chorionic cavity? A. Trophoblast and extraembryonic somatic mesoderm B. Amnion and epiblast C. Primary yolk sac and hypoblast D. Syncytiotrophoblast only 13. What structure connects the developing embryo to the trophoblast? A. Placental septum B. Amniotic stalk C. Connecting stalk D. Primitive umbilical ring 14. Which of the following hormones is secreted by the syncytiotrophoblast to maintain the corpus luteum? A. Progesterone B. Estrogen C. Human chorionic gonadotropin (hCG) D. Prolactin 😂💞 🤣 𝓦𝓪𝓲𝓽𝓲𝓷𝓰 𝓕𝓸𝓻 𝓨𝓸𝓾𝓻 𝓐𝓷𝓼𝔀𝓮𝓻 😂💞 🤣 𝐀𝐧𝐬𝐰𝐞𝐫𝐬 𝐭𝐨 𝐌𝐂𝐐𝐬: 👇😀 𝟭. 𝗕 𝟮. 𝗔 𝟯. 𝗖 𝟰. 𝗖 𝟱. 𝗗 𝟲. 𝗖 𝟳. 𝗕 𝟴. 𝗖 𝟵. 𝗖 𝟭𝟬. 𝗗 𝟭𝟭. 𝗔 𝟭𝟮. 𝗔 𝟭𝟯. 𝗖 𝟭𝟰. 𝗖 𝐅𝐨𝐫 𝐜𝐨𝐧𝐭𝐚𝐜𝐭: 📢 📌𝐄𝐦𝐚𝐢𝐥: aymn222@hotmail.com 📌𝐅𝐚𝐜𝐞𝐛𝐨𝐨𝐤 𝐩𝐞𝐫𝐬𝐨𝐧𝐚𝐥 𝐚𝐜𝐜𝐨𝐮𝐧𝐭:   / drayman.khanfour   📌𝐅𝐚𝐜𝐞𝐛𝐨𝐨𝐤 𝐠𝐫𝐨𝐮𝐩:   / 314015989895733   📌𝐓𝐞𝐥𝐞𝐠𝐫𝐚𝐦 𝐜𝐡𝐚𝐧𝐧𝐞𝐥: https://t.me/+k-LcyYc-0WsyNDg0 📌𝐓𝐞𝐥𝐞𝐠𝐫𝐚𝐦 𝐠𝐫𝐨𝐮𝐩: https://t.me/+S-dZx8Sf-LBiOWE0 📌𝐈𝐧𝐬𝐭𝐚𝐠𝐫𝐚𝐦:   / dr_aymn   📌𝐘𝐨𝐮𝐓𝐮𝐛𝐞 𝐜𝐡𝐚𝐧𝐧𝐞𝐥 𝐰𝐞𝐛𝐬𝐢𝐭𝐞 𝐥𝐢𝐧𝐤:    / @dr.ayman_khanfour   📞𝐌𝐨𝐛𝐢𝐥𝐞 (𝐚𝐧𝐝 𝐖𝐡𝐚𝐭𝐬𝐀𝐩𝐩): +20 1223815866 𝐇𝐚𝐬𝐡𝐭𝐚𝐠: 🔍 #second_week_development #amniotic_sac #yolk_sac