An Overview of Germ Layer Derivatives

সকল Derivatives এর সার-সংক্ষেপ।

Fig : Derivatives of germ layer.

Body-র বাইরে থেকে যা যা দেখা যায় সব ectoderm (mainly the external structures of the body seen from outside represent ectoderm)।

  1. Skin (epidermis),
  2. Nail,
  3. Hair,
  4. Eye,
  5. Ear,
  6. Nose,
  7. Mammary gland.

গলায় যা যা Viscera আছে (Mainly the viscera of the neck region)।

  1. Trachea,
  2. Oesophagus,
  3. Thyroid gland,
  4. Parathyroid gland,
  5. Thymus,
  6. Tonsil.


  1. All Muscles (Smooth muscles, skeletal muscles & cardiac muscle/ heart).
  2. All Vessels (Blood vessels, lymphatic vessels).

বাকি থাকে Systems গুলো। এক্ষেত্রে উপর থেকে নিচে নামতে হবে (Now remaining structures are the systems of the body. We have to start from above downwards, and it will be Ectoderm, Endoderm and Mesoderm serially)।

Let’s have a look:

Body-র একদম উপরের System (upper most system of body) represents Ectoderm।
It includes-

  • Nervous system (Both Central Nervous System and Peripheral Nervous System).

Body-র মাঝের Systems (middle systems of body) represents Endoderm।
It includes-

  • Respiratory system (Trachea to alveoli).
  • Digestive system (Oesophagus to anal canal).
  • Hepatobiliary system (Liver, Pancreas).

Body-র নিচের Systems (Lower most systems of body) represents Mesoderm।
It includes-

  • Reproductive system (যত reproductive structure আছে Testes, Ovary হাবিজাবি সব)।
  • Renal system (kidney, ureter, urinary bladder, urethra)।
    (*** শুধু এখানে মনে রাখতে হবে Lining of urinary bladder derives from endoderm)।

বাচ্চা বুড়া সবার কাজে দিবে।

Nazmul Huda Hridoy,
Jahurul Islam Medical College,
Session : 2015-16.

Platform academic / Ariful Islam Neloy.

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