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DEVELOPMENT
IN HUMANS
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.
GAMATOGENESIS:-
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
CLEVAGE:-
• ZYGOTE
• MORULA
• BLASTULA
• GASTRULA
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.
• 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
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.
Major derivatives of the embryonic germ layers
GROWTH:-
Development in human

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Development in human

  • 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.
  • 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. CLEVAGE:- • ZYGOTE • MORULA • BLASTULA • GASTRULA
  • 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. • 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. 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. Major derivatives of the embryonic germ layers