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

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What is the typical range of motion for extension in the thoracic spine?

10-25 degrees
20-45 degrees
30-55 degrees
40-70 degrees

The correct answer is: 20-45 degrees

The typical range of motion for extension in the thoracic spine is generally recognized to be between 20-45 degrees. This range is consistent with the anatomical and biomechanical properties of the thoracic vertebrae, which have unique structural configurations allowing for a certain degree of flexibility, especially when extending backward. Thoracic extension is limited compared to other spinal regions due to the ribcage's presence and the overall stability of the thoracic spine, which provides support for the upper body and protects vital organs. The limited range of motion is indicative of the thoracic spine's primary function in providing stability and facilitating respiratory mechanics, while still allowing some level of extension. Other ranges provided in the options reflect variations in individual flexibility or specific population studies, but the generally accepted range aligns with 20-45 degrees for most individuals. Thus, this answer provides a clear representation of the expected mobility in the thoracic spine during extension.