https://stream.echo6.co/videos/watch/fd6eca28-54e4-49bf-a4a1-66280c5b749e Official Ninja Nerd Website: https://ninjanerd.org Ninja Nerds! In this embryology lecture, Professor Zach Murphy guides you through fertilization, the first step in human development. This lecture breaks down the cellular and molecular events that occur when a sperm cell successfully penetrates a secondary oocyte, forming a genetically distinct zygote. We begin by exploring the sperm's journey through the female reproductive tract, detailing the processes of capacitation and the acrosomal reaction that allow for penetration of the corona radiata and zona pellucida. Zach then explains the mechanisms preventing polyspermy, including the cortical reaction, and highlights the fusion of male and female pronuclei to complete fertilization. You’ll also learn the precise timing and location of fertilization, its role in restoring diploidy, and how this single event triggers a cascade of developmental milestones—including the first mitotic divisions that lead to cleavage and blastocyst formation. Enjoy the lecture and support us below! 🌐 Official Links Website: https://www.ninjanerd.org Podcast: https://podcast.ninjanerd.org Store: https://merch.ninjanerd.org 📱 Social Media https://www.tiktok.com/@ninjanerdlectures https://www.instagram.com/ninjanerdlectures https://www.facebook.com/ninjanerdlectures https://x.com/ninjanerdsci/ https://www.linkedin.com/company/ninja-nerd/ 💬 Join Our Community Discord: https://discord.gg/3srTG4dngW #ninjanerd #Fertilization #Embryology Wed, 15 Apr 2026 14:01:00 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/fd6eca28-54e4-49bf-a4a1-66280c5b749e All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.