Which of the following forms the main framework of the trunk ?

Options

A. Ribs
B. Vertebral column
C. Sternum
D. Occipital condyles

Answer

To determine which structure forms the main framework of the trunk, we can analyze the options provided:

1. **Ribs**: The ribs are indeed part of the trunk but they primarily protect the thoracic cavity and support the upper body. They do not form the main framework.

2. **Vertebral Column**: The vertebral column, also known as the spine, runs along the back and provides structural support for the trunk. It is crucial for maintaining posture and allows for movement of the trunk. Therefore, it is the main framework of the trunk.

3. **Sternum**: The sternum, or breastbone, is located in the center of the chest and connects the ribs. While it plays a role in the structure of the thoracic region, it does not serve as the main framework of the trunk.

4. **Occipital Condyle**: The occipital condyle is a part of the skull that connects to the first cervical vertebra. It is not part of the trunk framework.

Based on this analysis, the correct answer is the **vertebral column**, as it forms the main framework of the trunk.

### Step-by-Step Solution:
1. Identify the options given: ribs, vertebral column, sternum, occipital condyle.
2. Analyze the role of each structure in relation to the trunk.
- Ribs: Protect the thoracic cavity; do not form the main framework.
- Vertebral Column: Provides structural support and allows movement; forms the main framework.
- Sternum: Connects ribs; not the main framework.
- Occipital Condyle: Connects skull to vertebrae; not part of the trunk.
3. Conclude that the vertebral column is the main framework of the trunk.