Development in human

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Development in human

  1. 1. DEVELOPMENT IN HUMANS
  2. 2. DEVELOPMENTAL BIOLOGY:- • It is the field of biology that deals with study of development of an organism from its earlier beginning to its maturity. • Dynamic process. • Two ways: 1)sexually and 2)asexually. • Two distinct phases : 1)Embryonic period and 2) Post embryonic period. • Embryology :Development in embryonic period.
  3. 3. GAMATOGENESIS:-
  4. 4. FERTILIZATION:- 1. Sperm contacts the egg 2. Sperm or its nucleus enters the egg 3. Egg becomes activated and developmental changes begin 4. Sperm and egg nuclei fuse
  5. 5. CLEVAGE:- • ZYGOTE • MORULA • BLASTULA • GASTRULA
  6. 6. GASTRULATION:- • A phase early in the development of most animal embryos, during which the morphology of the embryo is dramatically restructured by cell migration. • These cellular movements are called morphogenetic movements. • Two types: 1) Epiboly and 2) Emboly • Emboly – • Invagination is the local inward movement of cells from a cavity. • Involution is similar, but more dramatic. It is an inward expansion of epithelial cells around an edge such as the blastpore. • Ingression is the movement of individual cells from an epithelium into an embryonic cavity.
  7. 7. • The three layers produced by gastrulation are called embryonic germ layers • The ectoderm • Forms the outer layer of the gastrula • The endoderm • Lines the embryonic digestive tract • The mesoderm • Partly fills the space between the endoderm and ectoderm
  8. 8. ORGANOGENESIS:- • Differentiation of primary germ layers into tissues and organs. • Organogenesis is the period of animal development during which the embryo is becoming a fully functional organism capable of independent survival . • It is the process by which specific organs and structures are formed, and involves both cell movements and cell differentiation.
  9. 9. Major derivatives of the embryonic germ layers
  10. 10. GROWTH:-

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