Which is meant by the term "intercostals"?

The term "intercostals" specifically refers to the muscles and structures found between the ribs. These muscles are crucial for the mechanics of breathing, as they assist in expanding and contracting the thoracic cavity during inhalation and exhalation. The intercostal muscles play a vital role in respiration, providing stability to the rib cage while allowing for the necessary movement required for effective breathing.

The other options focus on different anatomical relationships that do not accurately describe the intercostals. While "situated between vessels" pertains to vascular anatomy, "found within a joint space" relates to joint structures, and "pertains to rib cage" is somewhat broad and does not specifically indicate the location or function of the intercostal muscles. Hence, the term "intercostals" is correctly defined as being located between the ribs.