6. 3 Germ Layers
ECTODERM: (Gives rise to the)
*Central nervous system (the brain
and spinal cord)
*Peripheral nervous system
MESODERM:
Connective Tissue
Cartilage
Heart Walls, Blood And Lymph
Vessels Cells
Bone
ENDODERM:
*Epithelial lining of the GI and
*Respiratory
*Liver
*Thyroid
16. Invaginating of Lens PLACODE & OPTIC VESICLE
• Lens Placode forms the Lens Vesicle (that pinches off the
surface ectoderm)
• Optic Vesicle forms the Bi-layered Optic Cup that
remains connected to the FOREBRAIN via the Optic Stalk