DERIVATIVES OF GERM LAYERS-3.ppt

germ layers

1. GERM LAYERS AND
THEIR DERIVATIVES

2. Derivatives of Germ Layers

3. Ectoderm

4. Neural Crest and its Derivatives
Theneuralcrestcellsmigrateextensivelytogenerateaprodigious
numberofdifferentiatedcelltypes.Thesecelltypesinclude
(1)the neurons and glial cells of the sensory, sympathetic, and
parasympathetic nervous systems,
(2)the epinephrine-producing (medulla) cells of the adrenal gland
(3)the pigment-containing cells of the epidermis
(4)many of the skeletal and connective tissue components of the head

6. Syndetome
(tendons)
Endothelial Cells
MESODERM

7. Althoughallthesomiteslookidentical,theywillform
differentstructuresatdifferentpositionsalongthe
anterior-posterioraxis.
Forinstance,theribsarederivedfromonlybythe
somitesformingthethoracicvertebrae.
Somites form
(1)thecartilageofthevertebraeandribs
(2) the muscles of the rib cage, limbs, and back
(3) the dermis of the dorsal skin.

8. Differentiation of Somites

9. ENDODERM
Phayrngeal

10. Development of Pancreas, Liver and Gall Bladder

11. Development of Respiratory System