bend和flex怎么区分？

The lateral vertebral muscles consist of the scalene muscles, which are deep to the sternocleidomastoid muscles, innervated by cervical nerves (C2–C7), and help to elevate the first and second ribs, bend the cervical spine, and flex the cervical spine. They consist of three pairs of muscles: the anterior, middle, and posterior scalene muscles. The anterior scalene muscles are the most anterior of the scalene muscles and originate from the anterior aspects of the C3–C6 transverse processes and travel inferiorly to converse as a tendon and insert onto the first and second ribs. The middle scalene muscles originate from the posterior aspects of the C2–C7 transverse processes and travel inferiorly and insert as a broad attached onto the first and second ribs. The posterior scalene muscles originate from the posterior aspects of the C5–C7 transverse processes and insert onto the second rib.

椎外侧肌由位于胸锁乳突肌深面的斜角肌组成，由颈神经（C2～C7）支配，帮助上提第一、第二肋骨，屈曲、侧曲颈椎。它们由前/中/后斜角肌三对肌肉组成。前斜角肌是斜角肌的最前部，起自C3～C6横突的前侧，向下穿行，形成肌腱，止于第一、第二肋。中斜角肌起源于C2～C7横突的后方，向下走行，以宽阔的肌群止于第一、第二肋上。后斜角肌起源于C5～C7横突的后侧，止于第二肋。

bend和flex怎么区分？

broad 怎么翻译更好？

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