EXTERNAL INTERCOSTALS Meaning and
Definition
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The term "external intercostals" refers to a specific group of muscles located between the ribs in the human body. These muscles are responsible for the process of inhalation, aiding in the expansion and contraction of the ribcage during breathing.
The external intercostals consist of eleven pairs of muscles that extend from the lower border of one rib to the upper border of the rib below it. They are referred to as "external" because they are situated on the outer surface of the ribcage, attached to the ribs themselves.
During inhalation, the external intercostals contract, causing the ribcage to expand. This action elevates the ribs while simultaneously lifting the sternum, creating a larger thoracic cavity. As a result, air rushes into the lungs, facilitating the intake of oxygen.
Conversely, during exhalation, the external intercostals relax, allowing the ribcage to return to its normal position. This contraction and relaxation of the muscles within the external intercostals are vital for the efficient movement of the diaphragm and lungs, aiding in the respiratory process.
The external intercostals are crucial for maintaining proper breathing patterns and ensuring the body receives an adequate amount of oxygen. Any disruption or dysfunction within these muscles can result in difficulties in breathing and respiratory complications.
Etymology of EXTERNAL INTERCOSTALS
The word "external intercostals" has its etymology rooted in Latin and Greek.
The term "external" comes from the Latin word "externus", meaning "outer" or "outside". It refers to something that is located on the outside or outer surface of a structure.
"Intercostals" is derived from the combination of two Latin words: "inter" meaning "between" and "costa" meaning "rib". The intercostal muscles are located between the ribs in the human body.
Therefore, the term "external intercostals" describes a specific group of muscles located on the outer surface between the ribs.
