go to jove.com

HIGH SCHOOL

Biology

Concept Videos

Anatomy and Physiology

This is a free preview. For full access

The Muscular System

How Thorax Muscles Drive Breathing

Description

Thorax muscles help breathing and support movement in the upper body. They also help keep the chest stable. Together, these muscles make the rib cage move while the lungs fill and empty.

The diaphragm is the main breathing muscle in the thorax. It is a wide, dome-shaped muscle that separates the ...

Transcript

深层胸肋间肌和膈肌对呼吸至关重要。

膈肌是一种圆顶状的肌肉结构,将胸腔与腹盆腔分隔开。

它起自肋笼下侧和腰椎,并止于中心腱。

此外,肋骨包含十一对肋间肌,分为外肋间肌、内肋间肌和最内肋间肌三组。

肋间外肌起自上方肋骨的下缘,止于下方肋骨的上缘。

相比之下,斜向排列的肋间内肌其起始点和止点位置则完全相反。

最深层的最内侧肌肉沿肋间内肌的走向分布,填充于肋骨之间的间隙。

吸气时,膈肌收缩并变平,以增大胸腔容积。

与此同时,肋间外肌收缩使肋骨上提,促进胸腔的前后径和横向扩张。

呼气时,膈肌放松,肋间内肌收缩,在最内层肌群的协助下使肋骨靠拢,从而减小胸腔容积。

More videos by Standards