embryology胚胎学.ppt

Copyright ? 2006/07 The University of Sharjah slide * Ref: Ten Cate (2003) Chapter 2 Along lateral axis to form the foregut. Completion of the embryonic period (2-8 week) Folding of the embryo Copyright ? 2006/07 The University of Sharjah slide *  Ten Cate (2003) Chapter 2 Copyright ? 2006/07 The University of Sharjah slide * 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). * Copyright ? 2006/07 The University of Sharjah DHS 2General EmbryologyLecture 1 Original Lecture: Prof. Grant Townsend, University of Adelaide Dr. Sausan Al Kawas University of Sharjah Copyright ? 2006/07 The University of Sharjah slide * Objectives To provide a general description of human embryological processes as follows: Germ cell formation fertilization Prenatal development Induction, competence, and differentiation Formation of three-layerd embryo Formation of neural crest Formation of human tissues Folding of the embryo Copyright ? 2006/07 The University of Sharjah slide * Embryology Embryology is literally “the study of the embryo” More generally it refers to “the study of prenatal development” Embryo = 2-8 weeks Foetus = 9 weeks to birth UNSW Embryology 2007 Copyright ? 2006/07 The University of Sharjah slide * Embryology Ontogeny : stages of development of an individual Teratology : study of abnormal development (congenital malformations) UNSW Embryology 2007 Copyright ? 2006/07 The University of Sharjah slide * Mitosis and Meiosis Copyright ? 2006/07 The University of Sharjah slide * Gametogenesis Gametogenesis is a pro