Thoracic chamber is formed dorsally by the `overset((i))"____"`, vertrally by the `overset((ii))"____"`, laterally by the `overset((iii))"____"` and on lower side by the dome shaped `overset((iv))"____"`.
Select the correct option to complete the above paragraph.

Options

A. `{:("(i)",(ii),(iii),(iv)),("vertebral column","sternum","ribs","diaphragm"):}`
B. `{:("(i)",(ii),(iii),(iv)),("sternum","vertebral column","diaphragm","ribs"):}`
C. `{:("(i)",(ii),(iii),(iv)),("diaphragm","ribs","vertebral column","sternum"):}`
D. `{:("(i)",(ii),(iii),(iv)),("ribs","diaphragm","vertebral column","sternum"):}`

Answer

To complete the paragraph regarding the formation of the thoracic chamber, we need to identify the structures that form its boundaries:

1. **Dorsally**: The thoracic chamber is formed dorsally by the **vertebral column**. The vertebral column, or spine, is located at the back of the thoracic cavity and provides support and protection for the spinal cord.

2. **Ventrally**: The thoracic chamber is formed ventrally by the **sternum**. The sternum, or breastbone, is located at the front of the thoracic cavity and serves as an attachment point for the ribs.

3. **Laterally**: The thoracic chamber is formed laterally by the **ribs**. The ribs are curved bones that form the sides of the thoracic cavity, protecting the lungs and heart.

4. **Lower side**: The thoracic chamber is formed on the lower side by the dome-shaped **diaphragm**. The diaphragm is a muscular structure that separates the thoracic cavity from the abdominal cavity and plays a crucial role in the process of breathing.

Putting it all together, the completed paragraph is:
"The thoracic chamber is formed dorsally by the **vertebral column**, ventrally by the **sternum**, laterally by the **ribs**, and on the lower side by the dome-shaped **diaphragm**."