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The medullary tube is formed by...

The medullary tube is formed by

A

Ectoderm

B

Mesoderm

C

Endoderm

D

None of the above.

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Germ Layers**: The human embryo consists of three primary germ layers: ectoderm, mesoderm, and endoderm. Each layer gives rise to different tissues and organs in the body. 2. **Identifying the Germ Layers**: - **Ectoderm**: This is the outermost layer and is responsible for forming structures such as the epidermis of the skin, the adrenal gland (specifically the medulla), the pituitary gland, and the pineal gland. - **Mesoderm**: This middle layer forms the dermis of the skin, connective tissues, the skeleton, and dentine of teeth. - **Endoderm**: The innermost layer forms the lining of the trachea, urinary bladder, and gastrointestinal tract. 3. **Focusing on the Medullary Tube**: The question specifically asks about the formation of the medullary tube. The medullary tube is associated with the central nervous system and is derived from the ectoderm. 4. **Conclusion**: Based on the information about the germ layers and their derivatives, the medullary tube is formed by the ectoderm. Therefore, the correct answer is option A: ectoderm. **Final Answer**: The medullary tube is formed by the ectoderm (Option A). ---
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