Germ Layers | Ectoderm, Mesoderm, Endoderm & Neural Crest | USMLE Step 1

Trace adult tissues to the three embryonic germ layers. Learn the surface ectoderm, neural tube, and neural crest branches, then distinguish epithelial linings from supporting tissues within the same organ. Watch the lesson, read its companion chapter, and take the matching Step 1 practice block: https://usmlefox.com/lesson/V060?utm_... In this lesson: • Gastrulation and the trilaminar embryonic disc • Surface ectoderm, neural tube, and neural crest derivatives • Muscle, connective tissue, blood, and cardiovascular origins • Kidneys, ureters, gonadal support, and primordial germ cells • Digestive and respiratory epithelia and glandular outgrowths • Adrenal cortex versus medulla; epidermis versus dermis • Bladder lining and the mature trigonal epithelium This lesson is not affiliated with the USMLE, NBME, or FSMB. Educational review for USMLE Step 1.