BIOL 1103 Lecture Notes - Intermediate Mesoderm, Mesonephros, Neural Crest

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Classic stuff: meiosis, homologous chromosomes, possible nondisjunction, etc. Day 1: fertilization, zygote is formed, in fallopian tube. Day 4: blastocoel is formed, zona pellucida breaks down. Bilaminar germ disc forms (epiblast and hypoblast) Gastrulation: primitive streak and node, formation of mesoderm and endoderm. Development in a cranial to caudal direction. Neurulation: neural plate, neural folds, neural plates; proceeds middle to ends. Paraxial, intermediate, and lateral plate mesoderm can be distinguished. Paraxial mesoderm forms somites, cranial to caudal direction; somites differentiate into dermo-, myo-, and sclerotome parts. Lateral plate mesoderm gives rise to somatic and splanchnic mesoderm, intraembryonic coelom forms. Folding laterally and craniocaudally, which is also important to gi development. Through week 8, embryogenesis of all major organ systems.

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