The boundaries of the neck's anterior cervical triangle are formed by the trachea, mandible, and
a. anterior cervical lymph nodes. c. sternocleidomastoid muscle.
b. cervical vertebrae. d. trapezius muscle.
C
The neck is made up of seven flexible cervical vertebrae that support the head while allowing it maximum mobility. The major muscles of the neck are the sternocleidomastoid and the trapezius. The sternocleidomastoid muscle extends from the upper portion of the sternum and the clavicle to the mastoid process and allows the neck to bend laterally, rotate, flex, and extend. This muscle also divides each side of the neck into two triangles: the anterior cervical and the posterior cervical. The anterior cervical triangle is formed by the mandible, the trachea, and the sternocleidomastoid muscle, and it contains the anterior cervical lymph nodes, the trachea, and the thyroid gland.
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