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HIGH SCHOOL

Biology

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Anatomy and Physiology

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The Muscular System

How Neck Muscles Guide Head Motion

Description

Neck muscles guide head motion by working together to bend, turn, and lift the head. They help with rotation, flexion, extension, and lateral bending. The sternocleidomastoid, or SCM, plus the suprahyoid and infrahyoid muscles are major head flexors.

The SCM runs from the sternum and clavicle to ...

Transcript

多块颈部肌肉有助于在枕寰关节处平衡头部并促进其运动。

例如,双侧胸锁乳突肌(SCM)与舌骨上肌群和舌骨下肌群共同构成主要的头部屈肌。

其起点位于胸骨和锁骨,止点位于颞骨的乳突。

当胸锁乳突肌双侧收缩时,可帮助头部向前屈曲。相反,单侧收缩则有助于同侧侧屈或对侧头部旋转。

颈部外侧肌肉——前、中、后斜角肌——斜向沿脊柱走行。

它们连接颈椎与前两根肋骨,并促进侧屈运动。

头夹肌是一块位于颈部后侧的肌肉,起自项韧带以及第7颈椎至第3胸椎的棘突,止于枕骨和颞骨。

双侧收缩时有助于头部后伸,单侧收缩则协助同侧侧屈和旋转。

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