More Related Content Similar to 1 embryology (20) 1. DHS 2 General Embryology Lecture 1 Original Lecture: Prof. Grant Townsend, University of Adelaide Dr. Sausan Al Kawas University of Sharjah 10. General Embryology Copyright © 2006/07 The University of Sharjah slide These images reproduced from Dr. Di Marzo Mature Human Egg Fertilized Human Zygote 4 Cell Human Embryo UNSW Embryology 2010 13. Copyright © 2006/07 The University of Sharjah slide . General Embryology Ref: Dental Embryology, Histology, and Anatomy Uterine tube Uterus Ovary 14. Copyright © 2006/07 The University of Sharjah slide General Embryology Ref: Dental Embryology, Histology, and Anatomy Division of the zygote Zygote. Formation of the morula Morula Blastula 15. Structure of the blastocyt (blastula): Copyright © 2006/07 The University of Sharjah slide 16. Copyright © 2006/07 The University of Sharjah slide Implantation of the blastocyte: Uterine wall Endometrium Digested endometrium Blastocyte 17. Copyright © 2006/07 The University of Sharjah slide Formation of embryonic layers: second week Ref: Dental Embryology, Histology, and Anatomy Bilaminar embryonic disc Secondary Yolk sac Endometrium Hypoblast amniotic cavity Epiblast 18. Copyright © 2006/07 The University of Sharjah slide Formation of the tri-laminar disc: Third week Formation of primitive streak at the midline causing the disc to have right and left half, each half will be as mirror to the other Primitive streak Bilaminar disc Epiblast layer Hypoblast layer 19. Copyright © 2006/07 The University of Sharjah slide Formation of primitive streak Formation of the tri-laminar disc: UNSW Embryology 2007 20. Copyright © 2006/07 The University of Sharjah slide Formation of the mesodermal layer: Movement of some cells of epiblast toward hypoblast at the primitive streak forms a third embryonic layer called mesoderm. Ectoderm layer Endoderm layer Mesoderm layer 21. Formation of Neural Crest Copyright © 2006/07 The University of Sharjah slide The nervous system develops as a thickening within ectoderm giving the neural plate. 23. Formation of Neural Crest Copyright © 2006/07 The University of Sharjah slide UNSW Embryology 2007 24. Copyright © 2006/07 The University of Sharjah slide Ref: Human Anatomy & Physiology/ Marieb 27. Copyright © 2006/07 The University of Sharjah slide The embryonic layers are distinct from each other and give rise to specific tissues such as: Nervous system. Sensory epi.of eye , ear & nose. Epidermis, hair and nails. Mammary & cutaneous glands. Epi.of sinuses,oral & nasal cavities . Intra-oral glands. Tooth enamel. Formation of the tissues: Ectoderm 28. Formation of the tissues: Copyright © 2006/07 The University of Sharjah slide Muscle tissue C.T Bone . Cartilage. Pulp. Dentin . Cementum. PL. Alveolar Bone . Mesoderm Ecto-mesoderm 29. Formation of the tissues: Copyright © 2006/07 The University of Sharjah slide GI tract epithelium & associated glands. Ref: Dental Embryology, Histology, and Anatomy Endoderm ECTODERM ENDODERM MESODERM Editor's Notes In humans, the notochord forms in week 3, is eventually lost from vertebral regions and contributes to the nucleus pulposus of the intervertebral disc during the formation of the vertebral column. The central region of the ectoderm forms a columnar epithelium described as the neural plate. This epithelium will fold dorsally to form the neural groove , which then fuses to form an initially open at either end hollow neural tube . The neural tube forms the central nervous system (brain and spinal cord).
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