The sternocleidomastoid muscle forms the anterior border of the lateral cervical triangle.

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Multiple Choice

The sternocleidomastoid muscle forms the anterior border of the lateral cervical triangle.

Explanation:
The posterior (lateral) cervical triangle is bordered in front by the sternocleidomastoid, behind by the trapezius, and below by the clavicle. Because the sternocleidomastoid sits at the front edge of this region, it forms the anterior border. It does not form the posterior border (that’s the trapezius) or the superior border. So the statement that the sternocleidomastoid forms the anterior border is correct.

The posterior (lateral) cervical triangle is bordered in front by the sternocleidomastoid, behind by the trapezius, and below by the clavicle. Because the sternocleidomastoid sits at the front edge of this region, it forms the anterior border. It does not form the posterior border (that’s the trapezius) or the superior border. So the statement that the sternocleidomastoid forms the anterior border is correct.

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