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Structures derived from 3 Germ layers : Embryology


Development Of Fetal Structures From the Three Germ Layers:

The three germ consiting of Ectoderm, mesoderm and endoderm give rise to all the organs and structures in the body. The list of structures developed from 3 primitive germ layers in given below.

embryo germ layers 248x300 Structures derived from 3 Germ layers : Embryology

Developing embryo

Skin Ectoderm-

  • Epidermis, hair, nails,
  • Cochlear duct, semicircular ducts,
  • Enamel of tooth,
  • Adenohypophysis,
  • Lens of eye,
  • Parotid gland,
  • Mammary gland,
  • Epithelial lining of lower anal canal.

Neuroectoderm:

  • All neurons within brain and spinal cord
  • Retina
  • Neurohypophysis
  • Astrocytes, Oligodendrocytes

Neural Crest-

  • Adrenal medulla
  • Ganglia- Sensory , Autonomic
  • Pigment cells
  • Schwann cells
  • Meninges- Pia and arachnoid mater
  • Pharyngeal arch cartilage
  • Ondontoblasts
  • Parafollicular C cells
  • Aorticopulmonary septum
  • Endocardial cushions


MESODERM-

  • Muscle ( Smooth, cardiac, skeletal)
  • Extraocular muscles ( Preotic somites)
  • Muscles of the tongue( occipital somites )
  • Connective tissue, dermis of skin
  • Bone, cartilage
  • Blood and lymph vessels
  • Heart
  • Adrenal cortex
  • Spleen’Kidney’Duramater
  • Testes and ovaries

Notocord- Nucleus pulposus

ENDODERM-

  1. Epithelial lining of Gastrointestinal tract, Trachea, bronchi, lungs
  2. Biliary apparatus
  3. Urinary Bladder, Urethra
  4. Vagina
  5. Auditory tube
  6. Middle ear cavity
  7. Parenchyma of :- Liver, Pancreas, Submandibular glands, Sublingual gland,Thyroid,Parathyroid

Tags: ectoderm, embryology, endoderm, germ layers, mesoderm


Last updated: September 2, 2010



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