Sternum vs. Vertebral Column

Attribute	Sternum	Vertebral Column
Location	In the center of the chest	Runs along the back of the body
Number of bones	1	26
Function	Protects the heart and lungs	Supports the body and protects the spinal cord
Shape	Flat and elongated	Irregular and segmented
Articulations	Articulates with the clavicles and ribs	Articulates with the ribs and pelvis

Structure

The sternum, also known as the breastbone, is a flat bone located in the center of the chest. It consists of three parts: the manubrium, the body, and the xiphoid process. The manubrium is the top portion of the sternum, while the body is the middle and largest part. The xiphoid process is the smallest and most inferior part of the sternum. On the other hand, the vertebral column, also known as the spine or backbone, is a series of 33 vertebrae that extend from the skull to the pelvis. These vertebrae are divided into five regions: cervical, thoracic, lumbar, sacral, and coccygeal.

Function

The sternum plays a crucial role in protecting the vital organs in the chest, such as the heart and lungs. It also serves as an attachment point for the ribs and muscles of the chest and abdomen. The sternum is essential for breathing and movement of the upper body. In contrast, the vertebral column provides structural support for the body and protects the spinal cord. It also allows for flexibility and movement of the trunk and head. The vertebral column plays a key role in posture and balance.

Composition

The sternum is composed of compact bone, which is dense and strong. This type of bone provides protection and support for the chest cavity. The vertebral column is made up of individual vertebrae, which are separated by intervertebral discs. These discs are composed of fibrocartilage, which allows for flexibility and shock absorption. The vertebrae themselves are made up of a combination of compact and spongy bone, which provides strength and support while also allowing for some degree of flexibility.

Development

The sternum develops from multiple segments of cartilage that fuse together during childhood and adolescence. The manubrium, body, and xiphoid process all ossify and fuse at different times. The development of the sternum is closely linked to the development of the ribs and the thoracic cage. On the other hand, the vertebral column develops from a series of cartilaginous structures called somites. These somites differentiate into the vertebrae and associated structures, such as the spinal cord and spinal nerves. The development of the vertebral column is a complex process that occurs during embryonic and fetal development.

Alignment

The sternum is aligned vertically in the center of the chest, between the two clavicles. It is positioned anteriorly to the heart and lungs and posteriorly to the thoracic vertebrae. The sternum is connected to the ribs via cartilaginous joints called costal cartilages. In contrast, the vertebral column is aligned vertically along the midline of the body. It is positioned posteriorly to the heart and lungs and anteriorly to the spinal cord. The vertebral column is connected to the ribs, pelvis, and skull, providing support and stability to the entire body.

Functionality

The sternum is essential for breathing, as it provides attachment points for the diaphragm and intercostal muscles. These muscles contract and relax to expand and contract the chest cavity during respiration. The sternum also plays a role in upper body movements, such as bending and twisting. The vertebral column allows for a wide range of movements, including flexion, extension, lateral flexion, and rotation. It also protects the spinal cord and nerves, which transmit signals between the brain and the rest of the body.

Injuries

The sternum is susceptible to fractures, especially in cases of blunt trauma to the chest. A sternal fracture can be painful and may interfere with breathing and movement. Treatment for a sternal fracture typically involves rest, pain management, and sometimes surgery. In contrast, the vertebral column is prone to a variety of injuries, including fractures, dislocations, and herniated discs. These injuries can result from trauma, degenerative conditions, or overuse. Treatment for vertebral column injuries may include rest, physical therapy, bracing, or surgery, depending on the severity of the injury.

Conclusion

In conclusion, the sternum and vertebral column are two important structures in the human body that serve distinct but complementary functions. While the sternum protects the vital organs in the chest and facilitates breathing and movement of the upper body, the vertebral column provides structural support, flexibility, and protection for the spinal cord. Understanding the similarities and differences between these two structures can help us appreciate the complexity and interconnectedness of the human body.