Explain the formation of different organ systems from the germ layers in human embryogenesis.

Explanation

### Step-by-Step Text Solution:

1. **Introduction to Germ Layers**:
- Humans are classified as triploblastic organisms, meaning they have three primary germ layers: ectoderm, mesoderm, and endoderm. Each of these layers contributes to the formation of different organ systems during embryogenesis.

2. **Ectoderm**:
- The ectoderm is the outermost germ layer. It is primarily responsible for forming structures related to the nervous system and the skin.
- **Key Contributions**:
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