KINESIOL 1A03 Lecture Notes - Lecture 7: Cloacal Membrane, Yolk Sac, Primitive Streak
14 Sep 2016
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Document Summary
Epiblast cells will move toward the centre and caudal. Create primitive streak, where epibast cells move through, displace hypoblast and from endoderm. 3 germ layers (embryonic disk): ectoderm, mesoderm, endoderm. Extends from the cephalic end of the primitive streak and develops towards the caudal end. Create induction : signals the ectoderm to form the neural plate (~18 days), determine what cell will develop into. Endoderm inner layer forms lining of digestive tract and derivatives. Middle layer forms tissues as such muscle, bone, blood vessels. Ectoderm outer layer forms skin and neuroectoderm. Neural tube formation refer to ppt starts in the midline and progresses to the cephalic and caudal ends. Neural tube: forms the brain and spinal cord, completely close at 26 days. Neural crest: sensory and post ganglionic autonomic portions of pns. Part of skull, dentin of teeth, some skeletal muscles general connective tissue of the head.
