النمو و أنواعه

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: 12-14

( zygote) : /1 2/ 3/

Developmental Biology Growth ( ) . : DNA : 1 ( ) 3 45 . : ( ) ( )

Cell Differentiation

( ). ( ...)

Stem Cells. Blastula :

DNA . . . : . . .

. . Chordata Cephalochordata .

Vegetal Pole Animal Pole . Vitelline Membrane . . Isolecithal egg telolecithal egg . oligolecithal . * .

:Head . Mid Piece . Tail .

:* : Meridional () Equal Holoblastic. * : () .* : Latitudinal Micromeres Macromeres .* : () (16) .* : () (32).* : (64). Morula Stage . Blastocoel Blastula Blastoderm.

Blastula :

: Flatting: . Invagination: Gastrocoel () Archenteron. Cup Shape Blastopore Gastrula :

. . . Lips :* Dorsal Lip .* Ventral Lip .* Lateral Lips .* .* :. Ectoderm: .. Endoderm: .* . .

Neural Plate Neural Groove Neural Folds Neural Tube Neural Canal Neurocoele . Neurula . Nervous System Mesoderm : Archenteric Pouches Somites. . Coelom. Somites :1. Myotome: .2. Dermatome: ( ).3. Sclerotome: . .* Somatic Mesoderm .* () Splanchnic (Visceral) Mesoderm Lateral Mesoderm

Notochord : Notochordal Cells Notochordal Groove. . Notochordal Rod. ( ) Enteron : Enteron or Gut. . Preoral Pit Preoral Cavity . Endostyle or Hypopharyngeal Groove Hatching : . Larva .* *