Anatomy and Cell Biology 3319 Lecture Notes - Lecture 4: Sensory Neuron, Posterior Grey Column, Central Canal
23 Sep 2016
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Document Summary
Embryo begins as bilaminar disc and eventually develops into a trilaminar disc (ectoderm, mesoderm, endoderm) Lateral folds start forming medially giving rise to the future cylindrical body structure. The ectoderm is particularly significant as it will become the. Cns caudal folding occurs as well: brain causes formation of cranial fold, spinal cord causes formation of caudal fold. Somites are the first body segments starting to form. Notochord formed from epiblast cells that invaginate at the primitive node and migrate anteriorly, during gastrulation: eventually develops into part of the vertebral column. Most ventrally can see yolk sac forming foregut and hindgut from the endoderm layer: foregut forms into the lining of the mouth, hindgut forms the lining of the anal canal. The notochord is located ventrally to the neural tube: notochord responsible for signaling the initiation/promotion of neurulation (formation of the neural tube) Ventral to the notochord is the future gut: only structure developed from endoderm.
