Costal margin

Costal Margin

The Costal Margin (pronounced: KOS-tal MAR-jin) is a term used in Anatomy to describe the anterior boundary of the Rib cage. It is formed by the left and right Costal arches, which are part of the skeletal system.

Etymology

The term "Costal Margin" is derived from the Latin words 'costa' meaning 'rib' and 'margo' meaning 'edge'. Thus, it literally translates to 'edge of the rib'.

Anatomy

The Costal Margin is formed by the medial edges of the eighth, ninth, and tenth ribs and their costal cartilages, which meet at the Xiphoid process of the Sternum. It forms an important part of the Thoracic cavity, protecting vital organs such as the Heart and Lungs.

Clinical Significance

The Costal Margin is an important landmark in medical examinations. It can be palpated during a physical examination to assess the size and position of the underlying organs. An enlarged or tender Costal Margin may indicate conditions such as Hepatomegaly (enlarged liver) or Splenomegaly (enlarged spleen).

Related Terms

Costal arch: The part of the rib cage that forms the Costal Margin.
Xiphoid process: The lower part of the sternum, where the Costal Margins meet.
Thoracic cavity: The part of the body enclosed by the rib cage, which includes the heart and lungs.
Hepatomegaly: A condition characterized by an enlarged liver.
Splenomegaly: A condition characterized by an enlarged spleen.