keelspatel

Keelspatel, also known as the keel bone, is a large, flat bone located in the lower part of the sternum, the breastbone. It is one of the most prominent bones in the human body and plays a crucial role in the structure and function of the ribcage. The keel bone is typically visible in the midline of the chest, extending from the manubrium to the xiphoid process. It is a remnant of the sternal fontanelle, a cartilaginous growth plate that closes during childhood, forming the adult sternum.

The keel bone is primarily composed of cancellous bone, which is spongy and porous, providing strength and flexibility. It is connected to the ribs by costal cartilage, which allows for the expansion and contraction of the ribcage during breathing. The keel bone also serves as an attachment point for various muscles, including the sternocleidomastoid and the pectoralis major, which are involved in neck and shoulder movements.

In some individuals, the keel bone may be more pronounced or visible, while in others, it may be less noticeable. The visibility of the keel bone can vary based on factors such as body build, age, and genetics. In rare cases, the keel bone may be absent or underdeveloped, a condition known as sternal aplasia or hypoplasia.

The keel bone is an important anatomical landmark and is often used as a reference point in medical examinations and procedures. It is also a common site for the insertion of intravenous (IV) catheters and other medical devices. Understanding the structure and function of the keel bone is essential for healthcare professionals in diagnosing and treating various medical conditions.