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 the options provided and identify the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding the Question**:
The question asks us to identify which structures are U-shaped and C-shaped from the given options.

2. **Analyzing the Options**:
- **Option 1: Hyoid bone and duodenum**
- **Option 2: Sternum bone and jejunum**
- **Option 3: Hyoid bone and ileum**
- **Option 4: Hyoid bone and colon**

3. **Identifying U-shaped Structure**:
- The **Hyoid bone** is known for its U-shaped structure. It is located in the neck and serves as an attachment point for muscles associated with swallowing and speech.

4. **Identifying C-shaped Structure**:
- The **duodenum**, which is the first part of the small intestine, is recognized for its C-shaped structure. It receives partially digested food from the stomach and plays a crucial role in digestion.

5. **Evaluating Other Options**:
- **Option 2**: The **sternum** (breastbone) is flat and does not have a U or C shape, and the **jejunum** is a part of the small intestine but not C-shaped.
- **Option 3**: The **ileum** is the final section of the small intestine and does not have a U shape.
- **Option 4**: The **colon** (large intestine) does not have a U shape and is not associated with the hyoid bone in this context.

6. **Conclusion**:
After analyzing all the options, the correct answer is **Option 1: Hyoid bone and duodenum**, as the hyoid bone is U-shaped and the duodenum is C-shaped.

### Final Answer:
The U-shaped and C-shaped structures are the **Hyoid bone and duodenum**.