The U - shaped and C - shaped structures are

Options

A. Hyoid bone and duodenum
B. Sternum bone and jejunum
C. Hyoid bone and ileum
D. Hyoid bone and colon

Answer

To solve the question regarding the U-shaped and C-shaped structures, we will analyze each option provided and identify which structures correspond to the given shapes.

### Step-by-Step Solution:

1. **Understanding the Shapes**:
- A U-shaped structure resembles the letter "U" and is typically open at the top.
- A C-shaped structure resembles the letter "C" and is curved, resembling a half-circle.

2. **Analyzing the Options**:
- **Option A: Hyoid bone and Duodenum**
- **Option B: Sternum bone and Jejunum**
- **Option C: Hyoid bone and Ileum**
- **Option D: Hyoid bone and Colon**

3. **Identifying the U-shaped Structure**:
- The **Hyoid bone** is known to be U-shaped. It is located in the neck, below the mandible (lower jaw), and serves as an attachment point for muscles associated with the tongue and neck.

4. **Identifying the C-shaped Structure**:
- The **Duodenum** is the first part of the small intestine and is C-shaped. It connects the stomach to the jejunum and plays a crucial role in digestion by receiving bile from the liver and pancreatic juices from the pancreas.

5. **Evaluating Other Options**:
- **Sternum bone**: This is a flat bone located in the center of the chest and is not U-shaped.
- **Jejunum**: This is the middle section of the small intestine and does not have a C-shape.
- **Ileum**: This is the last part of the small intestine and is not C-shaped.
- **Colon**: This is part of the large intestine and does not have a C-shape.

6. **Conclusion**:
- Based on the analysis, the U-shaped structure is the **Hyoid bone**, and the C-shaped structure is the **Duodenum**. Therefore, the correct answer is **Option A: Hyoid bone and Duodenum**.

### Final Answer:
**Option A: Hyoid bone and Duodenum**