How 1 Signaling Error Causes Severe Limb Malformations

USMLE Step 1: Limb Development and Skeletal Malformations — a no-voice, high-yield embryology video with labeled original diagrams and 16 clinical quizzes, each followed by explanations of every option. Learn the 3 limb axes and the key mechanisms: AER/FGF8 for proximodistal outgrowth, posterior ZPA/SHH for digit identity, and WNT7A for dorsal patterning. Review limb-bud timing, limb rotation, interdigital apoptosis, endochondral ossification, and the clues that distinguish syndactyly, polydactyly, amniotic-band disruption, thalidomide embryopathy, Holt-Oram syndrome, TAR syndrome, and Apert syndrome. Study with the USMLE Step 1 Questions channel. Like, share and subscribe for more embryology and integrated clinical questions. #USMLEStep1, #USMLE, #Embryology, #LimbDevelopmen,t #SkeletalMalformations, #MedicalSchool