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

Which anatomical borders define the anterior triangle of the neck?

1. Medial border of the SCM, inferior border of the clavicle, midline

2. Medial border of SCM, inferior border of the mandible, midline

3. Lateral border of SCM, superior border of the sternum, midline

4. Medial border of trapezius, inferior border of the mandible, lateral midline

The correct answer is: Medial border of SCM, inferior border of the mandible, midline

The anterior triangle of the neck is defined by specific anatomical landmarks that outline its borders. The correct answer identifies the medial border of the sternocleidomastoid muscle (SCM), the inferior border of the mandible, and the midline of the neck. The medial border of the SCM serves as one of the lateral boundaries of the triangle, positioning itself along the neck's side. The inferior border of the mandible forms the upper boundary, creating a defined area where important vascular and nervous structures are located. The midline represents the vertical boundary, ensuring that the triangle encompasses structures situated centrally within the neck. This configuration encompasses significant anatomical structures such as the carotid arteries, internal jugular vein, and various nerves, which are critical in clinical practice, including massage therapy and examinations for any pathologies. Understanding these borders is essential for accurately locating and addressing these anatomical features during treatment. Other options incorrectly define the borders either by misidentifying the relevant muscles or structures, such as the inclusion of the clavicle or the trapezius, which do not participate in outlining the anterior triangle. The specific relationship between the SCM, mandible, and midline characterizes the triangle distinctly, making option B the correct choice.