College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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Which of the following is an accurate statement about the costal groove?

It is found on the internal surface of the rib.
It is found on the external surface of the rib.
It is present in the clavicle.
It is absent in all ribs.

The correct answer is: It is found on the external surface of the rib.

The costal groove is a feature found on the internal surface of the rib. This anatomical structure provides a pathway for the intercostal nerves and blood vessels, which travel along the ribcage. The groove is strategically located to protect these nerves and vessels while allowing for movement and function of the ribs during respiration. The correct choice emphasizes the importance of this structure in the context of rib anatomy and its role in facilitating the functions of the intercostal muscles, which are essential for respiratory mechanics. The other options, which mention its presence on external surfaces, in the clavicle, or its absence in all ribs, do not accurately reflect the established anatomical characteristics of the costal groove.