Final answer:
The borders of the anterior triangle in the neck are the anterior border of the sternocleidomastoid muscle, the midline of the neck, and the inferior border of the mandible. The borders of the posterior triangle in the neck are the posterior border of the sternocleidomastoid muscle, the anterior border of the trapezius muscle, and the clavicle.
Step-by-step explanation:
The borders of the two regions in the neck, the anterior triangle and the posterior triangle, are as follows:
Anterior Triangle: The borders of the anterior triangle in the neck are the anterior border of the sternocleidomastoid muscle, the midline of the neck, and the inferior border of the mandible.
Posterior Triangle: The borders of the posterior triangle in the neck are the posterior border of the sternocleidomastoid muscle, the anterior border of the trapezius muscle, and the clavicle.